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September 18, 2014

September 18, 2014

Posted by **Lorie** on Saturday, April 6, 2013 at 9:06am.

A quantity, W, is directly proportional to X and the square of Y and inversely proportional to the cube of Z. W=3 when X=4, Y=2 and Z=4. What is the value of W when X=8, Y=9 and Z=6? Give answer to 3 decimal places.

Thanks in advance. I do not know much about inverse proportions.

- College math -
**Henry**, Monday, April 8, 2013 at 7:35pmW = KXY^2/Z^3 = 3

K4*2^2/4^3 = 3

16K/64 = 3

K/4 = 3

K = 12.

W = KXY^2/z^3 = 12*8*9^2/6^3 = 36.

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