A cone is inscribed in a cylinder. A square pyramid is inscribed in a rectangular prism. The cone and the pyramid have the same volume. Part of the volume of the cylinder, 1 V
1
, is not taken up by the cone. Part of the volume of the rectangular prism, 2
V
2
, is not taken up by the square pyramid. What is the relationship of these two volumes, 1
V
1
and 2
V
2
?