SOLUTION: 13/100 = 39/x

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Question 12340: 13/100 = 39/x
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
13%2F100+=+39%2Fx
13x%2F100+=+39
13x+=+39%2A100
13x+=+3900
x+=+3900%2F13
x+=+300

or for soemthing this "simple" in structure, you could just scale up the lefthand side as follows...

13%2F100+=+39%2Fx
39%2F300+=+39%2Fx

so comparing...x must be 300

jon.