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Finding the Fourth Proportional to 71,991.68, 99,348.84 and 40,161.92

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Solution

The fourth proportional to 71,991.68, 99,348.84 and 40,161.92 is: 55,423.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,991.68 : 99,348.84 = 40,161.92 : x
  2. Step 2: Convert to fraction form
    71,991.68/99,348.84 = 40,161.92/x
  3. Step 3: Cross multiply
    71,991.68x = 99,348.84 × 40,161.92
  4. Step 4: Simplify right side
    71,991.68x = 3,990,040,164.17
  5. Step 5: Solve for x
    x = 3,990,040,164.17/71,991.68
  6. Step 6: Final answer
    x = 55,423.63

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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.