To find the diameter of a circle given its circumference, you can use the formula for the circumference:
\[ C = \pi \times d \]
where \( C \) is the circumference and \( d \) is the diameter.
Given that the circumference \( C \) is approximately 574 meters and using \( \pi \approx 3.14 \), we can rearrange the formula to solve for the diameter \( d \):
\[ d = \frac{C}{\pi} \]
Substituting the values we have:
\[ d = \frac{574}{3.14} \]
Calculating this gives:
\[ d \approx \frac{574}{3.14} \approx 183.4 \text{ meters} \]
Therefore, the diameter of the circle, rounded to the nearest tenth, is approximately:
\[ \boxed{183.4 \text{ meters}} \]
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