So,
To divide a fraction by a fraction, all you need to do is invert the second fraction and multiply the resulting fractions.
Step 1: Flip the second fraction.
\(\frac{3}{8} / \frac{5}{4}\)
Step 2: Multiply the fractions.
\(\frac{15}{32}\ or\ 0.46875\ or\ 46.875\ percent\)