Ratio is the property between two numbers.
Ratio between a & b is written as a:b
Ratio can also be written as

Simplest form of Ratio.

Order relation between ratios.
Ratios given are . Which ratio is greater?
To determine let us multiply 4 & 6.It is 24. Then multiply 5 & 7. It is 35.
24 is smaller than 35. That means first multiplication is smaller than second multiplication.
That means first ratio is smaller than second ratio.