Answer
The sequence is geometric.
Work Step by Step
In order to determine whether or not a sequence is geometric, we need to find out if there is a common ratio, $r$, between the terms:
$r = \frac{3.6}{3} = 1.2$
$r = \frac{4.32}{3.6} = 1.2$
$r = \frac{5.184}{4.32} = 1.2$
The ratios between the terms are the same; therefore, the common ratio is $1.2$. The sequence is geometric.
