6th Class Mathematics Ratio and Propotion Ration and Proportion

Ration and Proportion

Category : 6th Class

Ratio and Proportion





  • Ratio is a method of comparing two quantities of the same kind by division.


  • The symbol used to represent a ratio is: and is read as 'is to'.


  • A ratio can be expressed as a fraction.


  • A ratio is always expressed in its simplest form.


  • A ratio does not have any unit, it is only a numerical value.


  • A ratio consists of two terms. The first term is called the antecedent and second term is called the consequent.


  • A ratio can be written in its simplest form by dividing the antecedent and consequent by their H.C.F.


  • The antecedent and consequent of a ratio cannot be interchanged. The order of terms in a ratio is important.


  • To express two terms in a ratio they should be in the same units of measurement.


  • When two ratios are equal they are said to be in proportion. The symbol for proportion is:: and is read as 'is as to'.


  • The two terms in the middle of a proportion are called means and the first and last terms are called extremes.


  • If two ratios are to be equal or to be in proportion, their product of means should be equal to the product of extremes.


  • If a : b :: c : d then the statement ad = be is true.


  • If a : b and b: c are in proportion such that b2 = ac then b is called the mean proportional of a : b and b : c.


  • We can get equivalent ratios by multiplying or dividing the antecedent and consequent of a ratio by the same number.


  • Unitary method: The method in which we find the value of one unit first and then the value of required number of units is called the unitary method.



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Notes - Ration and Proportion
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