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Finding the Fourth Proportional to 18,778.58, 28,143.27 and 7,672.61

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Solution

The fourth proportional to 18,778.58, 28,143.27 and 7,672.61 is: 11,498.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,778.58 : 28,143.27 = 7,672.61 : x
  2. Step 2: Convert to fraction form
    18,778.58/28,143.27 = 7,672.61/x
  3. Step 3: Cross multiply
    18,778.58x = 28,143.27 × 7,672.61
  4. Step 4: Simplify right side
    18,778.58x = 215,932,387.20
  5. Step 5: Solve for x
    x = 215,932,387.20/18,778.58
  6. Step 6: Final answer
    x = 11,498.86

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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.