RATIO AND PROPORTION

RATIO AND PROPORTION

Ratio is the spoken language of arithmetic. It is a way of comparing two or more

quantities having the same units.Proportion is an equality between two ratios or fractions. A proportion

can be written in two ways:

Equalities of two ratios.

2 out of 3 is equal to 4 out of 6

Therefore, the two ratios are equal, so they are in proportion.

2

3

=

4

6

hence, in a proportion the product of the means is equal to the

product of the extremes. 3 x 4 = 2 x 6.

12 = 12

Multiple Choice

What should be added to the ratio 5 : 11, so that the ratio becomes 3 : 4?

• 12

• 13

• 15

• 14

Expressing one value as

a fraction of another

given their ratio and vice

versa

• Two Main Parts of a Fraction

  1. Numerator refers to the number on the top of the line.

  - It tells how many equal parts of the whole or collection are taken.

  2. Denominator refers to the number below the line.

  - It shows the number of the whole is being divided. It functions as

  divisor of the numerator.

  Illustration:

  
  

  1

  2

Multiple Select

Expressing one value as

a fraction of another

given their Two Main Parts of a Fraction?

• Numerator

• Denominator

• Ratio

• Proportion