Answer:
The ratio of their corresponding side lengths is equal to 
Step-by-step explanation:
step 1
<em>Find the scale factor</em>
we know that
If two figures are similar, then the ratio of its surface areas is equal to the scale factor squared
Let
z-------> the scale factor
x----> the area of the smaller solid
y----> the area of the larger solid
so

In this problem we have

substitute

square root both sides
------> scale factor
Simplify

step 2
<em>Find the ratio of their corresponding side lengths</em>
we know that
If two figures are similar, then the ratio of its corresponding sides is equal to the scale factor
In this problem we have that the scale factor is equal to 
therefore
The ratio of their corresponding side lengths is equal to 