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Finding the Fourth Proportional to 74,138.92, 102,311.76 and 40,147.68

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Solution

The fourth proportional to 74,138.92, 102,311.76 and 40,147.68 is: 55,403.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,138.92 : 102,311.76 = 40,147.68 : x
  2. Step 2: Convert to fraction form
    74,138.92/102,311.76 = 40,147.68/x
  3. Step 3: Cross multiply
    74,138.92x = 102,311.76 × 40,147.68
  4. Step 4: Simplify right side
    74,138.92x = 4,107,579,800.72
  5. Step 5: Solve for x
    x = 4,107,579,800.72/74,138.92
  6. Step 6: Final answer
    x = 55,403.83

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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.