SOLUTION: The sum of the first 4 terms of a geometric series is 15 and the sum of the next 4 terms is 240 determine the positive constant ratio

Algebra ->  Sequences-and-series -> SOLUTION: The sum of the first 4 terms of a geometric series is 15 and the sum of the next 4 terms is 240 determine the positive constant ratio       Log On

 =  = 15.       (1)    (given)

 =  = 240.    (2)    (given)


Now divide eq(2) by eq(1). You will get


 =  = 16.


The positive constant ratio is  r = 16^(1/4) = 2.