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Finding the Fourth Proportional to 129,158.55, 178,240.37 and 71,801.37

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Solution

The fourth proportional to 129,158.55, 178,240.37 and 71,801.37 is: 99,086.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,158.55 : 178,240.37 = 71,801.37 : x
  2. Step 2: Convert to fraction form
    129,158.55/178,240.37 = 71,801.37/x
  3. Step 3: Cross multiply
    129,158.55x = 178,240.37 × 71,801.37
  4. Step 4: Simplify right side
    129,158.55x = 12,797,902,396.30
  5. Step 5: Solve for x
    x = 12,797,902,396.30/129,158.55
  6. Step 6: Final answer
    x = 99,086.76

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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.