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Finding the Third Proportional to 20,330 and 28,479

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Solution

The third proportional to 20,330 and 28,479 is: 39,894.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,330 : 28,479 = 28,479 : x
  2. Step 2: Convert to fraction form
    20,330/28,479 = 28,479/x
  3. Step 3: Cross multiply
    20,330x = 28,479 × 28,479
  4. Step 4: Simplify right side
    20,330x = 811,053,441
  5. Step 5: Solve for x
    x = 811,053,441/20,330
  6. Step 6: Final answer
    x = 39,894.41

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.