Solve for r 15=4/3pir^3

$15 = \frac{4}{3} π r^{3}$

Step 1

Rewrite the equation as $\frac{4}{3} \cdot (π r^{3}) = 15$ .

$\frac{4}{3} \cdot (π r^{3}) = 15$

Step 2

Multiply both sides of the equation by $\frac{1}{\frac{4}{3} π}$ .

$\frac{1}{\frac{4}{3} π} (\frac{4}{3} \cdot (π r^{3})) = \frac{1}{\frac{4}{3} π} \cdot 15$

Step 3

Simplify both sides of the equation.

Simplify the left side.

Simplify $\frac{1}{\frac{4}{3} π} (\frac{4}{3} \cdot (π r^{3}))$ .

Combine $\frac{4}{3}$ and $π$ .

$\frac{1}{\frac{4 π}{3}} (\frac{4}{3} \cdot (π r^{3})) = \frac{1}{\frac{4}{3} π} \cdot 15$

Multiply the numerator by the reciprocal of the denominator.

$1 \frac{3}{4 π} (\frac{4}{3} \cdot (π r^{3})) = \frac{1}{\frac{4}{3} π} \cdot 15$

Multiply $\frac{3}{4 π}$ by $1$ .

$\frac{3}{4 π} (\frac{4}{3} \cdot (π r^{3})) = \frac{1}{\frac{4}{3} π} \cdot 15$

Cancel the common factor of $π$ .

Factor $π$ out of $4 π$ .

$\frac{3}{π \cdot 4} (\frac{4}{3} \cdot (π r^{3})) = \frac{1}{\frac{4}{3} π} \cdot 15$

Factor $π$ out of $\frac{4}{3} \cdot (π r^{3})$ .

$\frac{3}{π \cdot 4} (π (\frac{4}{3} \cdot (r^{3}))) = \frac{1}{\frac{4}{3} π} \cdot 15$

Cancel the common factor.

$\frac{3}{π \cdot 4} (π (\frac{4}{3} \cdot (r^{3}))) = \frac{1}{\frac{4}{3} π} \cdot 15$

Rewrite the expression.

$\frac{3}{4} (\frac{4}{3} \cdot (r^{3})) = \frac{1}{\frac{4}{3} π} \cdot 15$

Combine $\frac{4}{3}$ and $r^{3}$ .

$\frac{3}{4} \cdot \frac{4 r^{3}}{3} = \frac{1}{\frac{4}{3} π} \cdot 15$

Multiply $\frac{3}{4}$ by $\frac{4 r^{3}}{3}$ .

$\frac{3 (4 r^{3})}{4 \cdot 3} = \frac{1}{\frac{4}{3} π} \cdot 15$

Multiply.

Multiply $4$ by $3$ .

$\frac{12 r^{3}}{4 \cdot 3} = \frac{1}{\frac{4}{3} π} \cdot 15$

Multiply $4$ by $3$ .

$\frac{12 r^{3}}{12} = \frac{1}{\frac{4}{3} π} \cdot 15$

Cancel the common factor of $12$ .

Cancel the common factor.

$\frac{12 r^{3}}{12} = \frac{1}{\frac{4}{3} π} \cdot 15$

Divide $r^{3}$ by $1$ .

$r^{3} = \frac{1}{\frac{4}{3} π} \cdot 15$

Simplify the right side.

Simplify $\frac{1}{\frac{4}{3} π} \cdot 15$ .

Combine $\frac{4}{3}$ and $π$ .

$r^{3} = \frac{1}{\frac{4 π}{3}} \cdot 15$

Multiply the numerator by the reciprocal of the denominator.

$r^{3} = 1 \frac{3}{4 π} \cdot 15$

Multiply $\frac{3}{4 π}$ by $1$ .

$r^{3} = \frac{3}{4 π} \cdot 15$

Multiply $\frac{3}{4 π} \cdot 15$ .

Combine $\frac{3}{4 π}$ and $15$ .

$r^{3} = \frac{3 \cdot 15}{4 π}$

Multiply $3$ by $15$ .

$r^{3} = \frac{45}{4 π}$

Step 4

Take the cube root of both sides of the equation to eliminate the exponent on the left side.

$r = \sqrt[3]{\frac{45}{4 π}}$

Step 5

Simplify $\sqrt[3]{\frac{45}{4 π}}$ .

Rewrite $\sqrt[3]{\frac{45}{4 π}}$ as $\frac{\sqrt[3]{45}}{\sqrt[3]{4 π}}$ .

$r = \frac{\sqrt[3]{45}}{\sqrt[3]{4 π}}$

Multiply $\frac{\sqrt[3]{45}}{\sqrt[3]{4 π}}$ by $\frac{{\sqrt[3]{4 π}}^{2}}{{\sqrt[3]{4 π}}^{2}}$ .

$r = \frac{\sqrt[3]{45}}{\sqrt[3]{4 π}} \cdot \frac{{\sqrt[3]{4 π}}^{2}}{{\sqrt[3]{4 π}}^{2}}$

Combine and simplify the denominator.

Multiply $\frac{\sqrt[3]{45}}{\sqrt[3]{4 π}}$ by $\frac{{\sqrt[3]{4 π}}^{2}}{{\sqrt[3]{4 π}}^{2}}$ .

$r = \frac{\sqrt[3]{45} {\sqrt[3]{4 π}}^{2}}{\sqrt[3]{4 π} {\sqrt[3]{4 π}}^{2}}$

Raise $\sqrt[3]{4 π}$ to the power of $1$ .

$r = \frac{\sqrt[3]{45} {\sqrt[3]{4 π}}^{2}}{{\sqrt[3]{4 π}}^{1} {\sqrt[3]{4 π}}^{2}}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$r = \frac{\sqrt[3]{45} {\sqrt[3]{4 π}}^{2}}{{\sqrt[3]{4 π}}^{1 + 2}}$

Add $1$ and $2$ .

$r = \frac{\sqrt[3]{45} {\sqrt[3]{4 π}}^{2}}{{\sqrt[3]{4 π}}^{3}}$

Rewrite ${\sqrt[3]{4 π}}^{3}$ as $4 π$ .

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{4 π}$ as ${(4 π)}^{\frac{1}{3}}$ .

$r = \frac{\sqrt[3]{45} {\sqrt[3]{4 π}}^{2}}{{({(4 π)}^{\frac{1}{3}})}^{3}}$

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$r = \frac{\sqrt[3]{45} {\sqrt[3]{4 π}}^{2}}{{(4 π)}^{\frac{1}{3} \cdot 3}}$

Combine $\frac{1}{3}$ and $3$ .

$r = \frac{\sqrt[3]{45} {\sqrt[3]{4 π}}^{2}}{{(4 π)}^{\frac{3}{3}}}$

Cancel the common factor of $3$ .

Cancel the common factor.

$r = \frac{\sqrt[3]{45} {\sqrt[3]{4 π}}^{2}}{{(4 π)}^{\frac{3}{3}}}$

Rewrite the expression.

$r = \frac{\sqrt[3]{45} {\sqrt[3]{4 π}}^{2}}{{(4 π)}^{1}}$

Simplify.

$r = \frac{\sqrt[3]{45} {\sqrt[3]{4 π}}^{2}}{4 π}$

Simplify the numerator.

Rewrite ${\sqrt[3]{4 π}}^{2}$ as ${({(4 π)}^{2})}^{\frac{1}{3}}$ .

$r = \frac{\sqrt[3]{45} \sqrt[3]{{(4 π)}^{2}}}{4 π}$

Apply the product rule to $4 π$ .

$r = \frac{\sqrt[3]{45} \sqrt[3]{4^{2} π^{2}}}{4 π}$

Raise $4$ to the power of $2$ .

$r = \frac{\sqrt[3]{45} \sqrt[3]{16 π^{2}}}{4 π}$

Rewrite $16 π^{2}$ as $2^{3} \cdot (2 π^{2})$ .

Factor $8$ out of $16$ .

$r = \frac{\sqrt[3]{45} \sqrt[3]{8 (2) π^{2}}}{4 π}$

Rewrite $8$ as $2^{3}$ .

$r = \frac{\sqrt[3]{45} \sqrt[3]{2^{3} \cdot 2 π^{2}}}{4 π}$

Add parentheses.

$r = \frac{\sqrt[3]{45} \sqrt[3]{2^{3} \cdot (2 π^{2})}}{4 π}$

Pull terms out from under the radical.

$r = \frac{\sqrt[3]{45} \cdot 2 \sqrt[3]{2 π^{2}}}{4 π}$

Combine exponents.

Combine using the product rule for radicals.

$r = \frac{2 \sqrt[3]{45 (2 π^{2})}}{4 π}$

Multiply $45$ by $2$ .

$r = \frac{2 \sqrt[3]{90 π^{2}}}{4 π}$

Cancel the common factor of $2$ and $4$ .

Factor $2$ out of $2 \sqrt[3]{90 π^{2}}$ .

$r = \frac{2 (\sqrt[3]{90 π^{2}})}{4 π}$

Cancel the common factors.

Factor $2$ out of $4 π$ .

$r = \frac{2 (\sqrt[3]{90 π^{2}})}{2 (2 π)}$

Cancel the common factor.

$r = \frac{2 \sqrt[3]{90 π^{2}}}{2 (2 π)}$

Rewrite the expression.

$r = \frac{\sqrt[3]{90 π^{2}}}{2 π}$

Step 6

The result can be shown in multiple forms.

Exact Form:

$r = \frac{\sqrt[3]{90 π^{2}}}{2 π}$

Decimal Form:

$r = 1.52991587 \dots$

Solve for r 15=4/3pir^3

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