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(2983) About Me  (Show Source):
You can put this solution on YOUR website!
cross multiply and see if the products are equal
PA%2FPB+=+PC%2FPD
PA%2APD+=+PC%2APB assumes neither PB or PD are zero
If the products are equal, then the proportion/ratios are the same