find the 3 numbers in geomatric progression if

Asked by  | 29th Sep, 2008, 06:38: PM

Expert Answer:

let the no. be a/r,a,ar

then a(1+r+1/r) = 28....(1)

and a3 = 512   ==> a=8

solving (1) for the value of r

2r+2+2r2 = 7r

2r2 -5r +2 =0

r=2 or 1/2

so the no's are 16,8,4   or 4,8,16

Answered by  | 30th Sep, 2008, 09:28: AM

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