# Check whether the given ratios are equal, i.e. they are in proportion. If yes, then write them in the proper form. 1. 1 : 5 and 3 : 15 2. 2 : 9 and 18 : 81 3. 15 : 45 and 5 : 25 4. 4 : 12 and 9 : 27 5.  10 to  15 and 4 to 6

S safeer

1. 1 : 5 and 3 : 15

$\frac{3}{15}=\frac{3}{3\times5}=\frac{1}{5}$

So the ratios are in proportion
2. 2 : 9 and 18 : 81

$\frac{2}{9}=\frac{2\times9}{9\times9}=\frac{18}{81}$

So So the ratios are in proportion
3. 15 : 45 and 5 : 25

$\\\frac{15}{45}=\frac{1}{3}\\\frac{5}{25}=\frac{1}{5}$

The given ratios are not equal, so they are not in proportion
4. 4 : 12 and 9 : 27

$\\\frac{4}{12}=\frac{1}{3}\\\frac{9}{27}=\frac{1}{3}$

The given ratios are equal, so they are in proportion
5.  10 to  15 and 4 to 6

$\\\frac{10}{15}=\frac{2}{3}\\\frac{4}{6}=\frac{2}{3}$

The given ratios are equal, so they are in proportion

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