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Finding the Fourth Proportional to 71,978.92, 99,331.08 and 40,149.88

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Solution

The fourth proportional to 71,978.92, 99,331.08 and 40,149.88 is: 55,406.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,978.92 : 99,331.08 = 40,149.88 : x
  2. Step 2: Convert to fraction form
    71,978.92/99,331.08 = 40,149.88/x
  3. Step 3: Cross multiply
    71,978.92x = 99,331.08 × 40,149.88
  4. Step 4: Simplify right side
    71,978.92x = 3,988,130,942.27
  5. Step 5: Solve for x
    x = 3,988,130,942.27/71,978.92
  6. Step 6: Final answer
    x = 55,406.93

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.