3/4
multiplying by 3 to both
=(3*3)/(4*3)
=9/12
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7
Two ratios, a:b and c:d are proportional if there is some number x such that a = cx and b = dx. Equivalently, if ad = bc (each is equal to cdx).
Yes
They are equivalent.
They are ratios like 2 over 1 that would represent 20 gallons to 1 gallon sugar