To determine if \( a = 4 \) is a solution to the equation \( 12a = 48 \), we can substitute \( a \) with 4 and check if the equation holds true.
Starting with the left side of the equation:
\[ 12a = 12 \times 4 = 48 \]
Now, we compare this with the right side of the equation:
\[ 48 = 48 \]
Since both sides are equal, \( a = 4 \) is indeed a solution to the equation \( 12a = 48 \).