If two ratios are equal, we say they are in proportion
Example:
1/2 & 3/6
∴ 1/2 = 3/6
i.e.
1 : 2 = 3 : 6
We also write it as
And we say that,
1, 2, 3, 6 are in proportion
Note:
When we write 4 numbers in proportion
1 , 2, 3, 6
1 , 6 are called extreme terms
2 , 3 are called middle terms
Are 10, 20, 40, 80 in proportion?
|
Ratio of 10 & 20 = 10/20 = 1/2
= 1 : 2 |
Ratio of 40 & 80 = 40/80 = 4/8 = 1/2 = 1 : 2 |
∴ 10 : 20 = 40 : 80
So, 10, 20, 40, 80 are in proportion
