Two solids are similar, with volumes of 54cm^3 and 16cm^3. If the larger solid has a surface area of 27cm^2, what is the surface area of the smaller solid?

So its a proportion...

16cm^3 X

_______ = ______

54cm^3 27cm^2

But how do i solve it? Cross multiply? do i have to turn them into cubed instead of squared?