Solve the proportion using cross product property 72/120 = 9/y

asked Jul 9, 2016 28.9k views

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72/120=9/y
cross multiply numerators and denominators
72×y=9×120
72y=1080
y=1080/72= 15

Kevinyu answered Jul 10, 2016

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$(72)/(120) = (9)/(y) \\(3)/(5) = (9)/(y) \\9 * 5 = 3 * y \\45 = 3y \\(45)/(3) = (3y)/(3) \\15 = y$

Honestann answered Jul 16, 2016

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