Home / 129,351.91-178,500.40-71,989.61

Finding the Fourth Proportional to 129,351.91, 178,500.40 and 71,989.61

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Solution

The fourth proportional to 129,351.91, 178,500.40 and 71,989.61 is: 99,342.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,351.91 : 178,500.40 = 71,989.61 : x
  2. Step 2: Convert to fraction form
    129,351.91/178,500.40 = 71,989.61/x
  3. Step 3: Cross multiply
    129,351.91x = 178,500.40 × 71,989.61
  4. Step 4: Simplify right side
    129,351.91x = 12,850,174,323.23
  5. Step 5: Solve for x
    x = 12,850,174,323.23/129,351.91
  6. Step 6: Final answer
    x = 99,342.75

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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.