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# Volume Similar Solids

The figures below are similar. What is the volume of the smaller cone?

The following proportion applies to similar solids:

where is the ratio of the corresponding dimensions, and is the ratio of the volumes.

Find the cube of the ratio of the corresponding dimensions:

Find the ratio of the volumes:

Use these two ratios to set up a proportion and solve for V1.

=

 8 × 8,000
=
125
 V1
Find the cross products

64,000 =
125
 V1
Simplify

 64,000 ÷ 125
=
125
 V1
÷ 125
Divide both sides by 125

512 =
 V1

The volume of the smaller cone is 512 cubic metres.

The figures below are similar.
What is the volume of the biggest triangular pyramid?        15 yd    3 yd     6 yd3  V2 = yd3