Geometric Progression: product of 1st 3 terms is 125

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If the product of the first 3 terms of a geometric progression is 125, what is the second term?

I immediately knew it was 5 but I don't know how to show it. This is what I came up with but I don't know where to go from here.

Ar*Ar^2*Ar^3=125

Thanks!
 
\(\displaystyle \L a \cdot ar \cdot ar^2 = 125\)

\(\displaystyle \L (ar)^3 = 125\)

\(\displaystyle \L ar = 5\)

ar is the second term.
 
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