Question

The third term of a geometric sequence is 32 and the fourth term is -108. Find the common ratio.

-3.375
-1.61
3.375
-1.43

Answer 1

-3.375

Explanation:

the point of a geometric sequence is that every new term is created by multiplying the previous term by a constant factor that is the same across the whole sequence.

that factor is called the common ratio.

so, 32 was multiplied by the common ratio, and we get -108 as result.

32 × cr = -108

cr = -108/32 = -27/8 = -3.375 = -3 3/8