mathematics

A goemetric progression is such that the 3rd term is 9times the first term ,while the 2nd term is one-twenty fourth of the 5th term.Find the 4th term

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  1. ar^2 = 9a
    so, r = 3 or -3

    24*ar = ar^4
    24 = r^3
    huh? I thought r^3 was 27.
    I suspect a typo.

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    oobleck
  2. ar^2=9a
    ar^2/a=9a/a
    r^2=9
    r=√9
    r=3 or -3

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