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Finding the Fourth Proportional to 71,871.76, 99,186.08 and 40,040.64

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Solution

The fourth proportional to 71,871.76, 99,186.08 and 40,040.64 is: 55,257.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,871.76 : 99,186.08 = 40,040.64 : x
  2. Step 2: Convert to fraction form
    71,871.76/99,186.08 = 40,040.64/x
  3. Step 3: Cross multiply
    71,871.76x = 99,186.08 × 40,040.64
  4. Step 4: Simplify right side
    71,871.76x = 3,971,474,122.29
  5. Step 5: Solve for x
    x = 3,971,474,122.29/71,871.76
  6. Step 6: Final answer
    x = 55,257.78

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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.