Ratio–
Ratio means the comparison of two terms by dividing one by the other.Continued
Ratio–If the ratio of two numbers is a:b and the ratio of two other quantities is b : c then a: b:c is said to be continued ratio.
For example –If a:b = 5 : 9 and b : c = 9:14, then a : b : c = 5 : 9 : 14 is a continue ratio.
Compound Ratio-For two or more ratios, if we take antecedent as product of antecedents of the ratios and consequent as product of consequents of the ratios, then the ratio thus formed is called mixed or compound ratio. The compound ratio of m : n and p :q is mp : nq.When two or more ratios are multiplies term wise, the ratio thus obtained is called compound ratio.
For example:The compounded ratio of the two ratios a : b and c : d is the ratio ac : bd, For ratios m : n and p :q; the compound ratio is (m × p) : (n × q).
Proportion–
Four quantities a, b, c and d are said to be in proportion if a : b = c : d. It can also be written as a:b :: c : d.
For example –8,16 and 19, 38 are in proportionAs 8 : 16 = 1:219 : 38 = 1:2
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