Question

Determine whether the following numbers are in proportion or not$:$

$15,16,20,21$

Answer 1

Step $1:$ To check whether the given numbers are in proportion or not

As we know that any four numbers $a,b,c$ and $d$ are said to be in proportion if and only if

$\frac{a}{b}=\frac{c}{d}$

Step $2:$ Given four numbers are $15,16,20,21$

Find the ratio of first and second number

$=\frac{15}{16}$

Step $3:$Now find the ratio of third and fourth number

$=\frac{20}{21}$

therefore the ratio of first term to second term is not equal to the ratio of third term to fourth term

$\frac{15}{16}$$\ne$$\frac{20}{21}$

Hence, the given four numbers $15,16,20,21$ are not in proportion.