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To solve this problem, we can use proportions.

We know that:
- 3 limes cost $0.39.

To find the cost of 1 lime:
\[
\text{Cost of 1 lime} = \frac{0.39}{3} = 0.13
\]

Now, to find the cost of 4 limes:
\[
\text{Cost of 4 limes} = 0.13 \times 4 = 0.52
\]

Thus, the cost of 4 limes is **$0.52**.

Would you like further explanation on this? Here are some follow-up questions:

1. How would the cost change for 6 limes?
2. What if the price for 3 limes was $0.45, how much would 5 limes cost?
3. How can we apply unit rates to solve this problem?
4. How can you check if your answer makes sense after solving a proportion problem?
5. Can this method be used for other types of proportional situations, such as cooking recipes?

**Tip:** Always break the problem into smaller parts (like finding the cost of 1 unit) to make it easier to handle.

If 3 limes sell for $0.39, how much will 4 limes cost?

Learn how to calculate the cost of 4 limes given the price of 3 limes at $0.39. This problem teaches proportions, unit rate calculation, and multiplication skills, making it suitable for students in Grades 5-7.

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