Tom K. answered 10/30/20
Knowledgeable and Friendly Math and Statistics Tutor
The length of the base will be 8 inches when it is 8 inches. You are asking about the volume.
If you divide the volumes by 1.5, the volume at 1 inches, you will notice a pattern:
1, 8, 27, 64, 125,...
Clearly, V = 1.5 l3
When l = 8, V = 1.5 l3 = 1.5 * 83 = 1.5 * 512 = 768
The volume of similar shapes is proportional to the cube of a linear measure of the figure (for a polyhedron, the length of a side, for a sphere, the radius, diameter, or circumference, ...