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Finding the Fourth Proportional to 20,379.68, 30,565.63 and 6,339.88

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Solution

The fourth proportional to 20,379.68, 30,565.63 and 6,339.88 is: 9,508.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.68 : 30,565.63 = 6,339.88 : x
  2. Step 2: Convert to fraction form
    20,379.68/30,565.63 = 6,339.88/x
  3. Step 3: Cross multiply
    20,379.68x = 30,565.63 × 6,339.88
  4. Step 4: Simplify right side
    20,379.68x = 193,782,420.96
  5. Step 5: Solve for x
    x = 193,782,420.96/20,379.68
  6. Step 6: Final answer
    x = 9,508.61

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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.