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Finding the Fourth Proportional to 129,379.71, 178,542.59 and 72,018.75

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Solution

The fourth proportional to 129,379.71, 178,542.59 and 72,018.75 is: 99,385.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,379.71 : 178,542.59 = 72,018.75 : x
  2. Step 2: Convert to fraction form
    129,379.71/178,542.59 = 72,018.75/x
  3. Step 3: Cross multiply
    129,379.71x = 178,542.59 × 72,018.75
  4. Step 4: Simplify right side
    129,379.71x = 12,858,413,793.47
  5. Step 5: Solve for x
    x = 12,858,413,793.47/129,379.71
  6. Step 6: Final answer
    x = 99,385.09

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1.5x scale

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.