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Finding the Fourth Proportional to 72,219.38, 99,662.41 and 40,388.41

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Solution

The fourth proportional to 72,219.38, 99,662.41 and 40,388.41 is: 55,735.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,219.38 : 99,662.41 = 40,388.41 : x
  2. Step 2: Convert to fraction form
    72,219.38/99,662.41 = 40,388.41/x
  3. Step 3: Cross multiply
    72,219.38x = 99,662.41 × 40,388.41
  4. Step 4: Simplify right side
    72,219.38x = 4,025,206,126.85
  5. Step 5: Solve for x
    x = 4,025,206,126.85/72,219.38
  6. Step 6: Final answer
    x = 55,735.81

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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.