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Finding the Third Proportional to 12,408 and 15,716

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Solution

The third proportional to 12,408 and 15,716 is: 19,905.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,408 : 15,716 = 15,716 : x
  2. Step 2: Convert to fraction form
    12,408/15,716 = 15,716/x
  3. Step 3: Cross multiply
    12,408x = 15,716 × 15,716
  4. Step 4: Simplify right side
    12,408x = 246,992,656
  5. Step 5: Solve for x
    x = 246,992,656/12,408
  6. Step 6: Final answer
    x = 19,905.92

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.