Ratio
& Proportion is an another important chapter from competition point of
view. First of all I would like to clear you the base concept of problems from
this chapter. This chapter is one of the easiest chapters for students to solve
with less calculations. These type of questions are frequently asked in SSC, IBPS, Bank, RRB,
bank clerical and other exams. Now lets read
the concepts of Aptitude Problems on Ratio & Proportions,
Proportional Division:- To divide a given quantity in such
parts which are in the given ratio, is called proportional division and parts
are known as proportional parts.
Example:- If Quantity “y”
is to be divided into three parts which are in the ratio of a:b:c then
First Part = (a/a+b+c) ×
y
Second Part = (b/a+b+c)
× y
Third Part = (c/a+b+c) ×
y
Mean
Proportional:-
The mean proportional between a and b is given by-
Mean Proportional = √(a×b)
Third
Proportional:-
If x be the third proportional to a and b then third proportional is given
by- a:b::b:x → a/b = b/x
Third Proportional = b2/a
Forth
Proportional:- If
x be the forth proportional to a, b and c then forth proportional is given by - a:b::c:x → a/b = c/x
Forth Proportional
= (b × c)/a
Componendo-
Dividendo Rule:-
If
a:b :: c:d
Then, (a+b)/(a-b) = (c+d)/(c-d)
or
(a-b)/(a+b) = (c-d)/(c+d)
Hope you have enjoyed the base concept of
this chapter till now. More Conceptual enjoyment with the Various Questions related to this
chapter which are frequently asked in the examinations will be presented to
your for self study on this blog soon, just keep
visiting this blog regularly and writing me your related queries through
comment or forum.
Best of Luck for Exams. To be continued
soon........................
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