Home / 129,338.92-178,490.10-71,983

Finding the Fourth Proportional to 129,338.92, 178,490.10 and 71,983

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Solution

The fourth proportional to 129,338.92, 178,490.10 and 71,983 is: 99,337.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,338.92 : 178,490.10 = 71,983 : x
  2. Step 2: Convert to fraction form
    129,338.92/178,490.10 = 71,983/x
  3. Step 3: Cross multiply
    129,338.92x = 178,490.10 × 71,983
  4. Step 4: Simplify right side
    129,338.92x = 12,848,252,868.30
  5. Step 5: Solve for x
    x = 12,848,252,868.30/129,338.92
  6. Step 6: Final answer
    x = 99,337.87

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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.