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 Description  
 Cross-product Property:  For two ratios, if a/b = c/d, then ad = bc.
For example:

Since 2/3 = 8/12, then 2*12 = 3*8 (note both = 24).

Since 5/6 = 15/18, then 5*18 = 6*15 (note both = 90).