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Finding the Fourth Proportional to 71,920.44, 99,248.79 and 40,087.44

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Solution

The fourth proportional to 71,920.44, 99,248.79 and 40,087.44 is: 55,319.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,920.44 : 99,248.79 = 40,087.44 : x
  2. Step 2: Convert to fraction form
    71,920.44/99,248.79 = 40,087.44/x
  3. Step 3: Cross multiply
    71,920.44x = 99,248.79 × 40,087.44
  4. Step 4: Simplify right side
    71,920.44x = 3,978,629,914.20
  5. Step 5: Solve for x
    x = 3,978,629,914.20/71,920.44
  6. Step 6: Final answer
    x = 55,319.88

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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.