Final answer:
The fraction 22/91 is already in its simplest form, so as a ratio it is expressed as 22:91, representing the proportional relationship between the numerator and the denominator.
Step-by-step explanation:
To change the fraction 22/91 into a ratio, we observe that a ratio can be expressed as the quotient of two numbers, which the fraction already represents. In fact, the fraction 22/91 is the ratio of 22 to 91. To write it in ratio form, we would simply use a colon to separate the numbers, resulting in 22:91.
If you want to express this as a ratio of whole numbers, the fraction is already in the simplest form, and there is no common factor to divide both the numerator and denominator by to obtain smaller whole numbers. Therefore, as a ratio of whole numbers, the fraction 22/91 is also 22:91. This represents the proportional relationship between the two numbers, similar to how 22 is to 91 as 2 is to 9, but 22 and 91 are not reducible in this case.