in the proportion, a/b = c/d, a and d are the extremes. from the def in my math book
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extremes
EXTREMES
The two outer terms of a proportion are known as extremes. These are the limits of a range of possibilities.
The numerator of the second ratio and the denominator of the first ratio are called the means, and the numerator of the first ratio and the denominator of the second ratio are called the extremes. The product of the means equals the product of the extremes.
... a proportion.... a proportion.... a proportion.... a proportion.