Question

Find x of 4,6,8,x are in proportion.

Answer 1

Answer:

$4 : 6 : : 8 : x \\ \\ x \times 4 = 6 \times 8 \\ \\ x = \frac{6 \times 8}{4} \\ \\ x = 6 \times 2 \\ \\ x = 12$

Answer 2

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$\bf4 : 6 : : 8 : x \\ \\ \bf \: x \times 4 = 6 \times 8 \\ \bf \: x = \frac{6 \times 8}{4} \\ \bf x = 6 \times 2 \\ \\ \bf \: x = 12$