SOLUTION: If b is positive, what is the value of b in the geometric sequence 9,a,4,b? Express your answer as a common fraction.

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Question 979755: If b is positive, what is the value of b in the geometric sequence 9,a,4,b? Express your answer as a common fraction.
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
9%2Ar%5E2=4

r%5E2=4%2F9

r=0%2B-+2%2F3, Either of them.

Using the positive ratio,
b=4%282%2F3%29
highlight%28b=8%2F3%29