SOLUTION: How do you prove two things are in proportion? ex: PA:PB=PC:PD

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Question 199739: How do you prove two things are in proportion?
ex: PA:PB=PC:PD
Answer by vleith(1925) About Me  (Show Source):
You can put this solution on YOUR website!
cross multiply and see if the products are equal

assumes neither PB or PD are zero
If the products are equal, then the proportion/ratios are the same