Let radii of two cylinders respectively be 3r and 2r and their heights be 4h and 3h.
Ratio of their volumes

= \( \Large \frac{\pi (3r)^2 (4h)}{\pi (2r)^2 3h} \)

=\( \Large \frac{36}{12} \)
= 3 ie.., 3 : 1