Relative values between quantities - ratios and proportions
The ratio of one quantity to an other is a fraction - and the number of times one quantity is contained in another quantity of the same kind.
The ratio between two quantities is the quotient obtained by dividing the first quantity by the second.
Example - Ratio
The ratio between 3 and 6 can be expressed as
3 / 6 = 1 / 2 = 0.5
Ratio can also be indicated by the sign ":" - like 3 : 6 or 1 : 2.
Reciprocal or Inverse Ratio
The reciprocal or inverse ratio is the opposite of the original ratio.
Example the Inverse Ratio
The inverse ratio between 6 and 3 can be expressed as
6 : 3 = 2 : 1 = 2
Proportion is the equality of ratios.
Example - Proportion
1 : 2 = 3 : 6