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Finding the Fourth Proportional to 8,651.38, 12,978.90 and 2,807.54

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Solution

The fourth proportional to 8,651.38, 12,978.90 and 2,807.54 is: 4,211.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,651.38 : 12,978.90 = 2,807.54 : x
  2. Step 2: Convert to fraction form
    8,651.38/12,978.90 = 2,807.54/x
  3. Step 3: Cross multiply
    8,651.38x = 12,978.90 × 2,807.54
  4. Step 4: Simplify right side
    8,651.38x = 36,438,780.91
  5. Step 5: Solve for x
    x = 36,438,780.91/8,651.38
  6. Step 6: Final answer
    x = 4,211.90

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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.