Find the **mean proportional** between 25 and 81.

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**Solution:**

1. The mean proportional between two numbers *a* and *b* is given by the square root of their product:

$$	ext{Mean Proportional} = \sqrt{a 	imes b}$$

2. Here, *a* = 25 and *b* = 81.

3. Calculate the product:

$$25 	imes 81 = 2025$$

4. Find the square root:

$$\sqrt{2025} = 45$$

**Answer:** $45$

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