Math Help - Direct & Joint Proportions

1. Direct & Joint Proportions

Please help me answer this problem. Thank you so much

If n is directly proportional to the cube of m and that n = 27 when m = 1 1/2, find:
a) the value of n when m = 2
d) the value of m when n = 125

2. Re: Direct & Joint Proportions

Originally Posted by gellie
Please help me answer this problem. Thank you so much

If n is directly proportional to the cube of m and that n = 27 when m = 1 1/2, find:
a) the value of n when m = 2
d) the value of m when n = 125
$n \propto m^3 \Rightarrow n = km^3$.

Use n = 27 when m = 1 1/2 to get the value of k. Then use your formula to answer a) and d).

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