To solve for the unknown, let's set up the proportion:

\[
\frac{7}{539} = \frac{22}{x}
\]

Cross-multiplying gives:

\[
7 \cdot x = 539 \cdot 22
\]

Calculating the right-hand side:

\[
539 \cdot 22 = 11858
\]

Now, divide both sides by 7 to solve for \( x \):

\[
x = \frac{11858}{7} = 1694
\]

Thus, the solution is:

\[
x = 1694
\]

Would you like more details or have any questions?

Here are 5 related questions for further practice:
1. Solve \( \frac{5}{25} = \frac{20}{x} \).
2. Find \( y \) if \( \frac{12}{36} = \frac{18}{y} \).
3. What is \( b \) when \( \frac{8}{64} = \frac{24}{b} \)?
4. Solve for \( z \) in the equation \( \frac{3}{45} = \frac{9}{z} \).
5. Find \( n \) such that \( \frac{10}{50} = \frac{n}{200} \).

**Tip:** Cross-multiplication is a powerful method for solving proportions and can also be used to check the equivalence of two ratios.

Learn how to solve the proportion 7/539 = 22/x step by step using cross-multiplication. This problem covers fundamental concepts in proportions and is ideal for students in Grades 6-8. The final solution gives x = 1694.

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