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The problem asks to find a number that makes the ratio equivalent to 1:4, with the format \(\text{?}:28\).

### Solution:

We are given the equivalent ratio \(1:4\) and asked to find the unknown number in the ratio \(\text{?}:28\).

The ratio \(1:4\) means that for every 1 unit in the first part, there are 4 units in the second part. This ratio can be expressed as:

\[
\frac{1}{4} = \frac{x}{28}
\]

To find \(x\), we can use cross-multiplication:

\[
1 \times 28 = 4 \times x
\]

\[
28 = 4x
\]

Now, solve for \(x\):

\[
x = \frac{28}{4} = 7
\]

Thus, the number is **7**. The equivalent ratio is **7:28**.

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Would you like more details, or have any further questions?

Here are 5 related questions for practice:
1. What is the equivalent ratio of \(2:5\) when the second term is 20?
2. Find the missing number in the ratio \(3:? = 6:18\).
3. If the ratio of \(5:9\) is scaled up by 3, what is the new ratio?
4. How do you simplify the ratio \(14:42\)?
5. What is the relationship between proportions and ratios?

**Tip:** When working with ratios, cross-multiplication is a quick way to solve for unknowns when you have equivalent ratios.

Find the number that makes the ratio equivalent to 1:4, where the second number is 28.

Solve the problem of finding the missing number that makes the ratio 1:4 equivalent to ?:28. Learn how to use proportions and cross multiplication for this type of ratio problem. Suitable for students in Grades 5-7.

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