To find \( \log_4 64 \), we can start by expressing 64 as a power of 4.
We know that:
\[ 64 = 4^3 \]
This is because:
\[ 4^1 = 4 \] \[ 4^2 = 16 \] \[ 4^3 = 64 \]
Now, using the definition of logarithms, we have:
\[ \log_4 64 = \log_4 (4^3) \]
By the properties of logarithms, we can simplify this to:
\[ \log_4 (4^3) = 3 \]
Thus, the value of \( \log_4 64 \) is:
\[ \log_4 64 = 3 \]