• Ratio: We compare two quantities using division then it is called ratio. It compares quantities in terms of ‘How many times’. The symbol to represent ratio is “:”.

It reads as “4 is to 3”    .    It can also be written as 4/3.

• Proportion: If we say that two ratios are equal then it is called Proportion.                                                                                           

We write it as a: b : : c: d or a: b = c: d  and reads as “a is to b as c is to d”.

• Extreme Terms and Middle Terms of Proportion