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### Theory:

A ratio is a comparison of values. In other words, 'a ratio describes how much of something exists in comparison with another'.
Example:
There are $$2$$ eggs and $$3$$ cups of flour.
Ratios can be shown in a variety of ways:
• Use "$$:$$ "to set the values as $$2$$$$:$$$$3$$.
• Perhaps we can use the word "to" as $$2$$ to $$3$$.
• It can also be expressed as a fraction $$\frac {2}{3}$$.
A proportion states that two ratios (or fractions) are the same.
Example:

We can easily see from the above picture that $$\frac {2}{3}$$ $$=$$ $$\frac {4}{6}$$.

In other words, $$2$$ eggs out of $$3$$ cups of flour is equal to $$4$$ eggs out of  $$6$$ cups of flour.

There is no difference in the ratios. Therefore, they are proportional.