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Finding the Fourth Proportional to 125,311.78, 187,905.46 and 39,911.50

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Solution

The fourth proportional to 125,311.78, 187,905.46 and 39,911.50 is: 59,847.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,311.78 : 187,905.46 = 39,911.50 : x
  2. Step 2: Convert to fraction form
    125,311.78/187,905.46 = 39,911.50/x
  3. Step 3: Cross multiply
    125,311.78x = 187,905.46 × 39,911.50
  4. Step 4: Simplify right side
    125,311.78x = 7,499,588,766.79
  5. Step 5: Solve for x
    x = 7,499,588,766.79/125,311.78
  6. Step 6: Final answer
    x = 59,847.44

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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.