A rational number between 4 and 6 is $\frac{9}{2}$ (which equals 4.5).

Would you like more examples or details on rational numbers?

Here are five related questions for further exploration:

1. What is a rational number between 5 and 6?
2. Can you explain the difference between rational and irrational numbers?
3. Is 4.75 a rational number? Why or why not?
4. How can we convert a decimal number like 5.2 into a rational number?
5. Are all integers also rational numbers?

Tip: A rational number is any number that can be expressed as the ratio of two integers.