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Finding the Third Proportional to 16,920 and 36,438

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Solution

The third proportional to 16,920 and 36,438 is: 78,470.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,920 : 36,438 = 36,438 : x
  2. Step 2: Convert to fraction form
    16,920/36,438 = 36,438/x
  3. Step 3: Cross multiply
    16,920x = 36,438 × 36,438
  4. Step 4: Simplify right side
    16,920x = 1,327,727,844
  5. Step 5: Solve for x
    x = 1,327,727,844/16,920
  6. Step 6: Final answer
    x = 78,470.91

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.