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Finding the Third Proportional to 18,681 and 20,337

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Solution

The third proportional to 18,681 and 20,337 is: 22,139.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,681 : 20,337 = 20,337 : x
  2. Step 2: Convert to fraction form
    18,681/20,337 = 20,337/x
  3. Step 3: Cross multiply
    18,681x = 20,337 × 20,337
  4. Step 4: Simplify right side
    18,681x = 413,593,569
  5. Step 5: Solve for x
    x = 413,593,569/18,681
  6. Step 6: Final answer
    x = 22,139.80

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.