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Finding the Fourth Proportional to 71,977.52, 99,326.84 and 40,145.70

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Solution

The fourth proportional to 71,977.52, 99,326.84 and 40,145.70 is: 55,399.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,977.52 : 99,326.84 = 40,145.70 : x
  2. Step 2: Convert to fraction form
    71,977.52/99,326.84 = 40,145.70/x
  3. Step 3: Cross multiply
    71,977.52x = 99,326.84 × 40,145.70
  4. Step 4: Simplify right side
    71,977.52x = 3,987,545,520.59
  5. Step 5: Solve for x
    x = 3,987,545,520.59/71,977.52
  6. Step 6: Final answer
    x = 55,399.87

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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.