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Suppose A is directly proportional to B, B is inversely proportional to C and C is inversely proportional to D. Determine whether A and D are directly proportional, inversely proportional, or neither.

asked by Nikki
  1. C is inversely proportional to D ---> C = p/D
    B is inversely proportional to C ---> B = qC
    so B = q/(p/D) = (q/p)D

    A is directly proportional to B --> A = rB
    A = r(q/p) D
    looks like A is directly proportional to D

    posted by Reiny

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