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Finding the Third Proportional to 20,919 and 31,432.50

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Solution

The third proportional to 20,919 and 31,432.50 is: 47,229.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919 : 31,432.50 = 31,432.50 : x
  2. Step 2: Convert to fraction form
    20,919/31,432.50 = 31,432.50/x
  3. Step 3: Cross multiply
    20,919x = 31,432.50 × 31,432.50
  4. Step 4: Simplify right side
    20,919x = 988,002,056.25
  5. Step 5: Solve for x
    x = 988,002,056.25/20,919
  6. Step 6: Final answer
    x = 47,229.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.