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Finding the Third Proportional to 8,561 and 18,520

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Solution

The third proportional to 8,561 and 18,520 is: 40,064.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,561 : 18,520 = 18,520 : x
  2. Step 2: Convert to fraction form
    8,561/18,520 = 18,520/x
  3. Step 3: Cross multiply
    8,561x = 18,520 × 18,520
  4. Step 4: Simplify right side
    8,561x = 342,990,400
  5. Step 5: Solve for x
    x = 342,990,400/8,561
  6. Step 6: Final answer
    x = 40,064.29

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.