To find what percent 39.4 is of 64, you can use the formula:
\[ \text{Percentage} = \left( \frac{\text{Part}}{\text{Whole}} \right) \times 100 \]
In this case, the part is 39.4 and the whole is 64. Plug in the values:
\[ \text{Percentage} = \left( \frac{39.4}{64} \right) \times 100 \]
Now, perform the division:
\[ \frac{39.4}{64} \approx 0.615625 \]
Next, multiply by 100 to convert it to a percentage:
\[ 0.615625 \times 100 \approx 61.5625 \]
Finally, round to the nearest hundredth:
\[ 61.56 \]
So, 39.4 is approximately 61.56% of 64.