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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?

 Sep 27, 2021
 #1
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a =b/c  k       where k  is proportionality constant

 

ac/b = k

 

Sub in the values given

  3*9 /5   = 27/5

 

Sub in the second set of numbers

 4c/3 = 27/5

c = 4.05

 Sep 27, 2021

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