Question

the third proportional of 0.8 and 0.2 is

Answer 1

The answer is 0.05.

$let \: the \: third \: proportional \: be \: x \\ 0.2 \times 0.2 = 0.8 \times x \\ x = (0.2 \times 0.2) \div 0.8 = 0.05$

Answer 2

The third proportional of 0.8 and 0.2 is 0.05.

Step-by-step explanation:

If third proportional of a and b is c, then a:b=b:c or

$\dfrac{a}{b}=\dfrac{b}{c}$

Let the third proportional of 0.8 and 0.2 is x, then

0.8:0.2 = 0.2:x

$\dfrac{0.8}{0.2}=\dfrac{0.2}{x}$

$4=\dfrac{0.2}{x}$

Multiply both sides by x.

$4x=0.2$

Divide both sides by 4.

$x=\dfrac{0.2}{4}$

$x=0.05$

Therefore, the third proportional of 0.8 and 0.2 is 0.05.

#Learn more

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