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 Everyday Examples
 Constant of proportionality:  The constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the constant of proportionality
If we were converting 3 feet into inches, we would use the proportion 1 foot=12 inches. The equation would be written y= (12 inches/ 1 foot) * (3 feet) = 36 inches.