Question:
The volume of a cube is 9261000 m3. Find the side of the cube.
Solution:
Volume of a cube is given by:
$V=s^{3}$, where $s=$ Side of the cube
It is given that the volume of the cube is 9261000 m3; therefore, we have:
$s^{3}=9261000$
Let us find the cube root of 9261000 using prime factorisation:
$9261000=2 \times 2 \times 2 \times 3 \times 3 \times 3 \times 5 \times 5 \times 5 \times 7 \times 7 \times 7=\{2 \times 2 \times 2\} \times\{3 \times 3 \times 3\} \times\{5 \times 5 \times 5\}$$\times\{7 \times 7 \times 7\}$
9261000 could be written as a triples of equal factors; therefore, we get:
Cube root $=2 \times 3 \times 5 \times 7=210$
Therefore
$s^{3}=9261000 \Rightarrow s=\sqrt[3]{9261000}=210$
Hence, the length of the side of cube is 210 m.