If 0.1 equals 100, we can set up a proportion to determine what 90 would equal.

The ratio can be written as:

\[
\frac{0.1}{100} = \frac{90}{x}
\]

Where \(x\) represents the value we want to find for 90.

To solve for \(x\), we can cross-multiply:

\[
0.1 \times x = 100 \times 90
\]

\[
0.1x = 9000
\]

Now divide both sides by 0.1:

\[
x = \frac{9000}{0.1} = 90000
\]

So, if 0.1 equals 100, then 90 would equal **90,000**.

Would you like more details or have any questions?

Here are 5 related questions:
1. What is a proportion, and how is it useful in solving problems like this?
2. How can cross-multiplying help solve ratio equations?
3. What would 0.5 equal if 0.1 equals 100?
4. How do you verify the correctness of proportional solutions?
5. How does scaling work in proportion problems like this one?

**Tip:** Always double-check your cross-multiplication step to avoid calculation mistakes.

Solve the proportion problem where 0.1 equals 100 and find what value 90 would equal. This problem explores key concepts such as ratios, proportions, and cross-multiplication. Ideal for students in Grades 6-8.

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