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Finding the Third Proportional to 3,919 and 8,408

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Solution

The third proportional to 3,919 and 8,408 is: 18,038.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919 : 8,408 = 8,408 : x
  2. Step 2: Convert to fraction form
    3,919/8,408 = 8,408/x
  3. Step 3: Cross multiply
    3,919x = 8,408 × 8,408
  4. Step 4: Simplify right side
    3,919x = 70,694,464
  5. Step 5: Solve for x
    x = 70,694,464/3,919
  6. Step 6: Final answer
    x = 18,038.90

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.