To set up the proportion based on the given height-to-length ratio requirement, we can express it as follows:
The required ratio of height (h) to length (l) is given by:
\[ \frac{h}{l} = \frac{1}{12} \]
For a ramp with a height of 2.2 feet, the required length is 26.4 feet.
Now, the ramp's height-to-length ratio can be expressed as:
\[ \frac{2.2}{26.4} \]
Now we can write the proportion comparing the required ratio to the ramp's actual ratio:
\[ \frac{1}{12} = \frac{2.2}{26.4} \]
So, the proportion in fraction form is:
\[ \frac{1}{12} = \frac{2.2}{26.4} \]
This establishes the relationship between the required and actual height-to-length ratios without reducing to lowest terms.