Let \( x \) be the total number of students surveyed. According to the problem, 73% of the students surveyed said their favorite color was purple. This can be expressed with the equation:
\[ 0.73x = 219 \]
To find \( x \), we can solve for \( x \) by dividing both sides of the equation by 0.73:
\[ x = \frac{219}{0.73} \]
Now, we can calculate \( x \):
\[ x \approx 300 \]
Thus, the total number of students surveyed is approximately \( \boxed{300} \).
To verify, we can calculate 73% of 300:
\[ 0.73 \times 300 = 219 \]
Since this is consistent with the information given in the problem, the answer is confirmed to be correct. The total number of students surveyed is indeed \( \boxed{300} \).