To find a proportion that is equivalent to \( \frac{55}{77} \), you can simplify the fraction first.
The greatest common divisor (GCD) of 55 and 77 is 11. Now, divide both the numerator and the denominator by their GCD:
\[ \frac{55 \div 11}{77 \div 11} = \frac{5}{7} \]
So, \( \frac{55}{77} = \frac{5}{7} \).
Therefore, \( 55/77 = 5/7 \).