# If (28 - x) is th

A number b is said to be mean proportional of two numbers a and c if

b2 = ac.

From the definition of mean proportion, we get:

(28 - x)2 = (23 - x)(19 - x)

784 + x2 – 56x = 437 - 42x + x2

-56x + 42x = 437 – 784

-14x= -347

x = 347/14

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