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Finding the Third Proportional to 20,918 and 31,423

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Solution

The third proportional to 20,918 and 31,423 is: 47,203.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918 : 31,423 = 31,423 : x
  2. Step 2: Convert to fraction form
    20,918/31,423 = 31,423/x
  3. Step 3: Cross multiply
    20,918x = 31,423 × 31,423
  4. Step 4: Simplify right side
    20,918x = 987,404,929
  5. Step 5: Solve for x
    x = 987,404,929/20,918
  6. Step 6: Final answer
    x = 47,203.60

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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.