Explanation:

- The relationship between the first number (9) and the second number (19) is that 19 is obtained by multiplying 9 by 2 and adding 1:

$$

9 \times 2 + 1 = 19

$$

- Applying the same pattern to the third number (29), multiply it by 2 and add 1:

$$

29 \times 2 + 1 = 59

$$

- Option 1: 59 – This follows the same pattern and is the correct related number.

- Option 2: 39 – Does not fit the pattern as \(29 \times 2 + 1\) yields 59.

- Option 3: 49 – Does not follow the pattern.

- Option 4: 69 – Also does not follow the given pattern.

- The correct answer is:

- Option 1: 59