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Finding the Third Proportional to 31,799 and 68,520

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Solution

The third proportional to 31,799 and 68,520 is: 147,645.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,799 : 68,520 = 68,520 : x
  2. Step 2: Convert to fraction form
    31,799/68,520 = 68,520/x
  3. Step 3: Cross multiply
    31,799x = 68,520 × 68,520
  4. Step 4: Simplify right side
    31,799x = 4,694,990,400
  5. Step 5: Solve for x
    x = 4,694,990,400/31,799
  6. Step 6: Final answer
    x = 147,645.85

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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.