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In a proportion, the product of the extremes is equal to the product of the means.
a/b=c/d ⇒ ad=bc
This property is also known as cross-multiplication or Means-Extremes Property of Proportion.
LHS * b=RHS* b
a/c* b = a* b/c
LHS * d=RHS* d
Commutative Property of Multiplication