First, we need to convert Dean's height from feet to inches. Since 1 foot is equal to 12 inches, we can calculate Dean's height in inches as follows:
\[ 4 \text{ feet} \times 12 \text{ inches/foot} = 48 \text{ inches} \]
Dean is currently 48 inches tall. The minimum height required to ride the Super Slide is 52 inches. To find out how many more inches he needs to grow, we subtract his current height from the required height:
\[ 52 \text{ inches} - 48 \text{ inches} = 4 \text{ inches} \]
Therefore, Dean needs to grow 4 more inches to be tall enough to ride the Super Slide.