Suppose a is directly proportional to b, but inversely proportional to c. If a = 3 when b = 5 and c =9, then what is c when b=3 and a = 4?
+37159 a = K * b/c solve for the proportionality constant 'K' with the first numbers given
3 = K * 5/9
K = 27/5
a = 27/5 b/c now sub in the second a and b
4 = 27/5 3/c
c = 27/5 * 3/4 = 4.05
