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Finding the Third Proportional to 20,430 and 31,374

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Solution

The third proportional to 20,430 and 31,374 is: 48,180.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430 : 31,374 = 31,374 : x
  2. Step 2: Convert to fraction form
    20,430/31,374 = 31,374/x
  3. Step 3: Cross multiply
    20,430x = 31,374 × 31,374
  4. Step 4: Simplify right side
    20,430x = 984,327,876
  5. Step 5: Solve for x
    x = 984,327,876/20,430
  6. Step 6: Final answer
    x = 48,180.51

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.