The common ratio, r = (1/4)/(3/16)
= (1/4)(16/3)
= 4/3
OR
(1/3)/(1/4) = (1/3)(4/1)
= 4/3
The common ratio of a geometric sequence is the ratio of any two consecutive terms.
Suppose we are given a geometric sequence: a1, a2, a3, ...
The common ratio is given as:
a2/a1 = a3/a2 = ...