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Finding the Fourth Proportional to 129,912.62, 179,138.92 and 112,769.96

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Solution

The fourth proportional to 129,912.62, 179,138.92 and 112,769.96 is: 155,500.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,912.62 : 179,138.92 = 112,769.96 : x
  2. Step 2: Convert to fraction form
    129,912.62/179,138.92 = 112,769.96/x
  3. Step 3: Cross multiply
    129,912.62x = 179,138.92 × 112,769.96
  4. Step 4: Simplify right side
    129,912.62x = 20,201,488,842.84
  5. Step 5: Solve for x
    x = 20,201,488,842.84/129,912.62
  6. Step 6: Final answer
    x = 155,500.59

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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.