Question

The first and third term of a gp are 5 and 80 what is the fourth term

Answer 1

Mm do u have the answer yet?

Answer 2

Let r be the common ratio, then the first four terms are

`5, 5r, 5r^2, 5r^3`

`5r^2 = 80`

`r^2 = 16`

`r = 4`

Fourth term
`5r^3 = 320`

Answer: 320