SIGN IN VERSION Proportions
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A proportion can be set up many ways as long as the corresponding
relationships are kept in order.
For example, if a car travels at a constant rate of 160 miles every 3 hours, how long will it take it to travel 200 miles?
One way to set up this equation is miles1/hours1 = miles2/hours2
160/3 = 200/x
Using cross multiplication we obtain 160x = 600 and therefore x=3.75 hours
But we could also set up the equation as miles1/miles2 = hours1/hours2
160/200 = 3/x
Using cross multiplication we obtain 160x = 600 and therefore x=3.75 hours (same answer, different starting point).