Ratio and Proportion definition and signs with examples.

Ratio is to compare two quantities, whereas proportion is an equation which shows that two ratios are equivalent. Examples are rate of speed which is ratio of distance and time.
Price which is ratio of Dollars and meters or Dollars and Kilograms
Ratio can be written as in three different ways
1- fraction, 2- using the word “to” or “is to”
3- using a colon sign
Examples 2/3, can be written as 2:3 or 2 is to 3