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Finding the Fourth Proportional to 8,408.05, 12,605.92 and 2,859.90

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Solution

The fourth proportional to 8,408.05, 12,605.92 and 2,859.90 is: 4,287.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,408.05 : 12,605.92 = 2,859.90 : x
  2. Step 2: Convert to fraction form
    8,408.05/12,605.92 = 2,859.90/x
  3. Step 3: Cross multiply
    8,408.05x = 12,605.92 × 2,859.90
  4. Step 4: Simplify right side
    8,408.05x = 36,051,721.46
  5. Step 5: Solve for x
    x = 36,051,721.46/8,408.05
  6. Step 6: Final answer
    x = 4,287.76

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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.