SOLUTION: A geometric sequence has four positive terms a1,a2,a3,a4. If a3/a1=9 and a1+a2=4/3, then what is a3?
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Question 1168533: A geometric sequence has four positive terms a1,a2,a3,a4. If a3/a1=9 and a1+a2=4/3, then what is a3?
Answer by josgarithmetic(39616) (Show Source): You can put this solution on YOUR website!
If common ratio is r then and therefore .
Given
and from use of the ratio found,
.
.
From that, term at index 3 is .
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