SOLUTION: the 3rd and 4th terms of geometric progression are 12 and 8 respectively.find the sum to infinity of progression? plz solve my this question. thanks a lot.

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Question 1083106: the 3rd and 4th terms of geometric progression are 12 and 8 respectively.find the sum to infinity of progression?
plz solve my this question. thanks a lot.
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
The ratio is 2/3
The second term would be 18 and the first term 27
The sum is a/(1-r)=27/(1/3)=81
27+18+12+8+16/3+32/9+....converges to 81.