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Finding the Fourth Proportional to 129,487.26, 178,650.72 and 78,520.44

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Solution

The fourth proportional to 129,487.26, 178,650.72 and 78,520.44 is: 108,332.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,487.26 : 178,650.72 = 78,520.44 : x
  2. Step 2: Convert to fraction form
    129,487.26/178,650.72 = 78,520.44/x
  3. Step 3: Cross multiply
    129,487.26x = 178,650.72 × 78,520.44
  4. Step 4: Simplify right side
    129,487.26x = 14,027,733,140.72
  5. Step 5: Solve for x
    x = 14,027,733,140.72/129,487.26
  6. Step 6: Final answer
    x = 108,332.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.