SOLUTION: The First and Fourth terms of a geometric sequence are 5 and 135. Use the geometric sequence formula to find the value of r. (R=Rate or Ratio) Any Help will be appreciated.

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Question 377686: The First and Fourth terms of a geometric sequence are 5 and 135. Use the geometric sequence formula to find the value of r. (R=Rate or Ratio) Any Help will be appreciated.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,

The First and Fourth terms of a geometric sequence are 5 and 135

Note: for a geometric series: a%5Bn%5D+=+a%5B1%5D%2Ar%5E%28n-1%29

a%5B4%5D+=+a%5B1%5D%2Ar%5E%284-1%29

a%5B4%5D+=+a%5B1%5D%2Ar%5E3

135 = 5*r^3

27 = r^3

3 = r