The square root of 89.4 is approximately:

$\sqrt{89.4} \approx 9.457$

This value is rounded to three decimal places. Would you like more details on how to compute this, or do you have any other questions?

Here are 5 related questions to consider:

1. What is the square root of 100?
2. How can you estimate the square root of a number without a calculator?
3. What is the difference between a perfect square and a non-perfect square?
4. How do you simplify square roots involving fractions?
5. Can you compute square roots using logarithms?

Tip: The square root of non-perfect squares can often be estimated by finding the closest perfect squares and then refining the approximation.