Are the following numbers in proportion?
15,20,25,30.

Answer

To determine if the numbers 15, 20, 25, and 30 are in proportion, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Numbers**: We have four numbers: A = 15, B = 20, C = 25, D = 30.

2. **Set Up the Proportion**: To check if these numbers are in proportion, we need to compare the ratios A/B and C/D.

3. **Calculate the First Ratio (A/B)**:
\[ \frac{A}{B} = \frac{15}{20} \]
To simplify this fraction, we can divide both the numerator and the denominator by 5:
\[ \frac{15 \div 5}{20 \div 5} = \frac{3}{4} \]

4. **Calculate the Second Ratio (C/D)**:
\[ \frac{C}{D} = \frac{25}{30} \]
Similarly, we simplify this fraction by dividing both the numerator and the denominator by 5:
\[ \frac{25 \div 5}{30 \div 5} = \frac{5}{6} \]

5. **Compare the Two Ratios**: Now we have:
- First Ratio: \( \frac{3}{4} \)
- Second Ratio: \( \frac{5}{6} \)

Since \( \frac{3}{4} \) is not equal to \( \frac{5}{6} \), we conclude that the numbers are not in proportion.

6. **Final Conclusion**: Therefore, the answer is **No, the numbers 15, 20, 25, and 30 are not in proportion**.