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Finding the Third Proportional to 8,408 and 12,428

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Solution

The third proportional to 8,408 and 12,428 is: 18,370.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,408 : 12,428 = 12,428 : x
  2. Step 2: Convert to fraction form
    8,408/12,428 = 12,428/x
  3. Step 3: Cross multiply
    8,408x = 12,428 × 12,428
  4. Step 4: Simplify right side
    8,408x = 154,455,184
  5. Step 5: Solve for x
    x = 154,455,184/8,408
  6. Step 6: Final answer
    x = 18,370.03

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.