Sphere : Cylinder
2 :3
Reason
Formula of a sphere is actually 2/3 times the volume of the cylinder
Sphere is (2/3) 2•pi•r^2 •h
the height of a sphere is the diameter or 2 times radius
the formula of a sphere is
(2/3) 2 • pi • r^2 • 2r
simplified is
(2 • 2/3) (r • r^2) • pi
(4/3) (r^3) pi