what is the ratio of the volumes of a sphere and a cone with the base diameter and the altitude of the cone equal to the diameter of the sphere?

what is the ratio of the volumes of a sphere and a cone with the base diameter and the altitude of the cone equal to the diameter of the sphere?
Use the formulas to calculate the volumes.

You finally get:

$\displaystyle V_{sphere}\ :\ V_{cone} = 4\ : \ 1$