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One standard way is it use colons , For example

7:14::6:12

read as 7 is to 14 as 6 is to 12.

The number in the middle are called the means; those on either end are called the

extremes. In a correct proportion, the product of the means equals the product of

the extremes. In the example, note that 7 times 12 = 14 times 6.

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14y ago

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