lets say each side length of the prism is 1, 3, and 4,
1x3x4=12 cubic meters
you then times each by four
1x4=4
3x4=12
4x4=16
you then multiply them together
4x12x16
and the answer would be what it equals
4x12x16=768 cubic meters
so the new prism's volume would be 768 cubic meters