What is the compounded ratio of (2 : 5), (5 : 11) and (33 : 8)?

A compound ratio is obtained by multiplying two or more ratios term-wise.

The compounded ratio of (x : y), (a : b) is xa :  yb

The compounded ratio of (2 : 5), (5 : 11) and (33 : 8) = (2 x 5 x 33) : (5 x 11 x 8) = 3 : 4