# Proportion

When two ratios are equal, the four quantities composing them are said to be in proportion.
If , then a, b, c, d are in proportions.

Direct proportion : If A and B are directly proportional then we denote it by A  B.
Also, A = kB, k is constant

Some Examples:
1. Work done  number of men
2. Cost  number of Articles
3. Work  wages
4. Working hour of a machine  fuel consumed
5. Speed  distance to be covered

Indirect Proportion (or inverse proportion) :
If A and B are indirectly proportional then we denote it by . Also,  (k is a constant)

Some Examples:
1. More men, less time
2. Less men, more hours
3. More speed, less taken time to be covered distance