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Finding the Fourth Proportional to 394,174.85, 591,163.85 and 128,011.55

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Solution

The fourth proportional to 394,174.85, 591,163.85 and 128,011.55 is: 191,985.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,174.85 : 591,163.85 = 128,011.55 : x
  2. Step 2: Convert to fraction form
    394,174.85/591,163.85 = 128,011.55/x
  3. Step 3: Cross multiply
    394,174.85x = 591,163.85 × 128,011.55
  4. Step 4: Simplify right side
    394,174.85x = 75,675,797,146.59
  5. Step 5: Solve for x
    x = 75,675,797,146.59/394,174.85
  6. Step 6: Final answer
    x = 191,985.35

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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.