Given that △XYZ is similar to △AYB (△XYZ ∼ △AYB), we can use the properties of similar triangles to find the length of \( YX \).
We are given the following lengths:
- \( YB = 25 , \text{ft} \)
- \( YA = 16 , \text{ft} \)
- \( YZ = 88 , \text{ft} \)
From the similarity of the triangles, we have the following proportion involving the sides:
\[ \frac{YZ}{YB} = \frac{YX}{YA} \]
Substituting the known lengths into the equation gives us:
\[ \frac{88}{25} = \frac{YX}{16} \]
To find \( YX \), we can cross multiply:
\[ 88 \cdot 16 = 25 \cdot YX \]
Calculating \( 88 \cdot 16 \):
\[ 88 \cdot 16 = 1408 \]
So we have:
\[ 1408 = 25 \cdot YX \]
Now, divide both sides by 25 to solve for \( YX \):
\[ YX = \frac{1408}{25} = 56.32 , \text{ft} \]
Therefore, the length of \( YX \) is \( \boxed{56.32 , \text{ft}} \).