Answer
Yes, the sequence is geometric.The common ratio is $\frac{3}{4}$
Work Step by Step
You have the sequence:256,192,144 and 108. Find the common ratio by using the formula: R=$\frac{a2}{a1}$=$\frac{a4}{a3}$.Plug in the values:
r=$\frac{192}{256}$=$\frac{3}{4}$
r=$\frac{108}{144}$=$\frac{3}{4}$
There is a common ratio, r=$\frac{3}{4}$. So the sequence is geometric.
