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Finding the Fourth Proportional to 18,943.43, 28,405.11 and 8,408.87

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Solution

The fourth proportional to 18,943.43, 28,405.11 and 8,408.87 is: 12,608.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,943.43 : 28,405.11 = 8,408.87 : x
  2. Step 2: Convert to fraction form
    18,943.43/28,405.11 = 8,408.87/x
  3. Step 3: Cross multiply
    18,943.43x = 28,405.11 × 8,408.87
  4. Step 4: Simplify right side
    18,943.43x = 238,854,877.33
  5. Step 5: Solve for x
    x = 238,854,877.33/18,943.43
  6. Step 6: Final answer
    x = 12,608.85

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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.