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Finding the Third Proportional to 31,408 and 66,488

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Solution

The third proportional to 31,408 and 66,488 is: 140,749.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,408 : 66,488 = 66,488 : x
  2. Step 2: Convert to fraction form
    31,408/66,488 = 66,488/x
  3. Step 3: Cross multiply
    31,408x = 66,488 × 66,488
  4. Step 4: Simplify right side
    31,408x = 4,420,654,144
  5. Step 5: Solve for x
    x = 4,420,654,144/31,408
  6. Step 6: Final answer
    x = 140,749.30

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.