We know that:
[tex]1feet=12in.[/tex]Therefore:
[tex]13feet=12*13in.[/tex]Then we can rewrite the given ratio as follows:
[tex]173\text{ to }12*13.[/tex]Notice that 173, 12, and 13 are prime numbers, then we cannot reduce the above ratio.
Answer:
[tex]\frac{173}{156}.[/tex]