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
- Work done number of men
- Cost number of Articles
- Work wages
- Working hour of a machine fuel consumed
- 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)
- More men, less time
- Less men, more hours
- More speed, less taken time to be covered distance