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Finding the Fourth Proportional to 74,912.85, 103,379.90 and 40,921.61

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Solution

The fourth proportional to 74,912.85, 103,379.90 and 40,921.61 is: 56,471.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,912.85 : 103,379.90 = 40,921.61 : x
  2. Step 2: Convert to fraction form
    74,912.85/103,379.90 = 40,921.61/x
  3. Step 3: Cross multiply
    74,912.85x = 103,379.90 × 40,921.61
  4. Step 4: Simplify right side
    74,912.85x = 4,230,471,228.13
  5. Step 5: Solve for x
    x = 4,230,471,228.13/74,912.85
  6. Step 6: Final answer
    x = 56,471.90

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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.