Theory:

A ratio is a comparison of values. In other words, 'A ratio says how much of one thing there is compared to another one'.
Example:
There are \(2\) eggs and \(3\) cups of flour.
 
ratio.png
 
Ratios can be shown in a variety of ways:
  • Use "\(:\) "to set the values as \(2\)\(:\)\(3\).
  • Or maybe we can use the word "to" as \(2\) to \(3\).
  • Or write it down as a fraction \(\frac {2}{3}\).
Proportion states two ratios (or fractions) are the same.
Example:
proporation.png
 
From the above picture, we can easily understand that \(\frac {2}{3}\) \(=\) \(\frac {4}{6}\).
 
Therefore, \(2\) eggs out of \(3\) cups of flour is equal to \(4\) eggs out of  \(6\) cups of flour.
 
The ratios are the same. So, they are in proportion.