To find equivalent ratios to $4:15$, you can multiply or divide both terms of the ratio by the same number. Here are some examples of equivalent ratios:

1. Multiply both by 2:
   $4 \times 2 : 15 \times 2 = 8 : 30$

2. Multiply both by 3:
   $4 \times 3 : 15 \times 3 = 12 : 45$

3. Multiply both by 4:
   $4 \times 4 : 15 \times 4 = 16 : 60$

4. Divide both by 2 (if it were possible to simplify, but in this case, it's not because 15 isn't divisible by 2).

5. Multiply both by 5:
   $4 \times 5 : 15 \times 5 = 20 : 75$

Therefore, the equivalent ratios are:

• $8:30$
• $12:45$
• $16:60$
• $20:75$

Would you like further details on this process, or do you have any questions?

Here are five related questions:

1. How do you simplify a ratio?
2. Can you divide both numbers by any common factor in a ratio?
3. What are some real-life examples where ratios are used?
4. What is the difference between a proportion and a ratio?
5. How do you compare two different ratios?

Tip: To find equivalent ratios quickly, use multiplication or division on both terms of the ratio by the same number.