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Finding the Fourth Proportional to 71,963.88, 99,309.90 and 40,131.96

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Solution

The fourth proportional to 71,963.88, 99,309.90 and 40,131.96 is: 55,381.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,963.88 : 99,309.90 = 40,131.96 : x
  2. Step 2: Convert to fraction form
    71,963.88/99,309.90 = 40,131.96/x
  3. Step 3: Cross multiply
    71,963.88x = 99,309.90 × 40,131.96
  4. Step 4: Simplify right side
    71,963.88x = 3,985,500,934.40
  5. Step 5: Solve for x
    x = 3,985,500,934.40/71,963.88
  6. Step 6: Final answer
    x = 55,381.96

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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.