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There are many situations in our daily lives where we must see how one quantity changes in response to other.
  
By increasing (or decreasing), two quantities /(X/) and /(Y/) show their proportionality in terms of their quantities and amounts.
 
According to proportional rules, the quantity changes the amount concerning each other.
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Example:
(i) The total cost will increase if the number of items purchased increases.
 
(ii) The more money is deposited in a bank, the more interest is earned.
 
(iii) As the speed of the vehicle increases, the amount of time taken to cover the same distance decreases.
 
(iv) For a given job, the greater the number of workers, the less time it will take to complete the work.