1.

**Direct Proportion:**
Two quantities are said to be
directly proportional, if on the increase (or decrease) of the one, the other
increases (or decreases) to the same extent.

**Eg.**Cost is directly proportional to the number of articles. (More Articles, More Cost)
2.

**Indirect Proportion:**
Two quantities are said to be
indirectly proportional, if on the increase of the one, the orther decreases to
the same extent and vice-versa.

Eg. The time taken by a car is
covering a certain distance is inversely proportional to the speed of the car.
(More speed, Less is the time taken to cover a distance.)

**Note:**In solving problems by chain rule, we compare every item with the term to be found out.

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