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Finding the Fourth Proportional to 129,311.52, 193,769.82 and 54,390.66

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Solution

The fourth proportional to 129,311.52, 193,769.82 and 54,390.66 is: 81,502.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,311.52 : 193,769.82 = 54,390.66 : x
  2. Step 2: Convert to fraction form
    129,311.52/193,769.82 = 54,390.66/x
  3. Step 3: Cross multiply
    129,311.52x = 193,769.82 × 54,390.66
  4. Step 4: Simplify right side
    129,311.52x = 10,539,268,397.88
  5. Step 5: Solve for x
    x = 10,539,268,397.88/129,311.52
  6. Step 6: Final answer
    x = 81,502.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.