Rate and Ratio are two terms you are more likely to encounter in subjects like mathematics, business, etc. You will actually find them interesting if you understand what they stand for and how they are calculated. The term 'rate' can be used in various ways. First of all, you can use it to determine the proportional relationship between one amount and another. For example: with the recent development in the department, the company can now produce machines at the rate of 20 a year.
It can also be used to describe the speed with which something is moving. For example The motorcycle is moving at one hell of a rate. It can also be used to refer to the price of the thing. Ratio, on the other hand, is used to determine the relationship between two or more similar items in terms of quantity, amount, and size. Unlike rate, which defines the relationship between two items, Ratio can be used for more than two items.