To convert the expression \( \sqrt[3]{216} \) to using rational exponents, we can express it as:
\[ 216^{\frac{1}{3}} \]
Thus, the rational exponent on the expression equivalent to \( \sqrt[3]{216} \) is:
\[ \frac{1}{3} \]
From the options you provided, the correct response is:
Start Fraction 1 over 3 End Fraction (which as a fraction is \( \frac{1}{3} \)).