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Finding the Fourth Proportional to 8,318.86, 12,480.15 and 3,124.78

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Solution

The fourth proportional to 8,318.86, 12,480.15 and 3,124.78 is: 4,687.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,318.86 : 12,480.15 = 3,124.78 : x
  2. Step 2: Convert to fraction form
    8,318.86/12,480.15 = 3,124.78/x
  3. Step 3: Cross multiply
    8,318.86x = 12,480.15 × 3,124.78
  4. Step 4: Simplify right side
    8,318.86x = 38,997,723.12
  5. Step 5: Solve for x
    x = 38,997,723.12/8,318.86
  6. Step 6: Final answer
    x = 4,687.87

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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.