The average growth factor, or geometric mean, of the given values $1.131$, $1.043$, and $1.021$ is approximately $1.064$, rounded to four decimal places.

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Here are five related questions you might find helpful:

1. What is the difference between the arithmetic mean and geometric mean?
2. How do interest rates compound in a financial context?
3. Can the geometric mean be used for negative values?
4. How does geometric mean apply in measuring stock market returns?
5. Why is the geometric mean more appropriate for growth rates than the arithmetic mean?

Tip: The geometric mean is often preferred in finance because it reflects the compounding effect over time, especially when dealing with growth rates.