SOLUTION: why do proportions solve it that way? 767:452=n;342

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Question 176125: why do proportions solve it that way?
767:452=n;342
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
767:452=n;342
452n=342*767
452n=262,314
n=262,314/452
n=580.34 ans.