The formula for the circumference \( C \) of a circle is given by:
\[ C = \pi \times d \]
where \( d \) is the diameter of the circle. To find the diameter, we can rearrange the formula:
\[ d = \frac{C}{\pi} \]
Given that the circumference \( C \) is approximately 574 meters and using \( \pi \approx 3.14 \), we can substitute these values into the formula:
\[ d = \frac{574}{3.14} \]
Calculating the value gives:
\[ d \approx 182.4 \]
Thus, the diameter of the circle, rounded to the nearest tenth, is approximately:
\[ \boxed{182.4} \text{ meters} \]