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Finding the Fourth Proportional to 71,919.20, 99,249.80 and 40,084.68

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Solution

The fourth proportional to 71,919.20, 99,249.80 and 40,084.68 is: 55,317.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,919.20 : 99,249.80 = 40,084.68 : x
  2. Step 2: Convert to fraction form
    71,919.20/99,249.80 = 40,084.68/x
  3. Step 3: Cross multiply
    71,919.20x = 99,249.80 × 40,084.68
  4. Step 4: Simplify right side
    71,919.20x = 3,978,396,473.06
  5. Step 5: Solve for x
    x = 3,978,396,473.06/71,919.20
  6. Step 6: Final answer
    x = 55,317.59

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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.