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Finding the Fourth Proportional to 258,756.28, 388,134.39 and 71,767.78

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Solution

The fourth proportional to 258,756.28, 388,134.39 and 71,767.78 is: 107,651.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,756.28 : 388,134.39 = 71,767.78 : x
  2. Step 2: Convert to fraction form
    258,756.28/388,134.39 = 71,767.78/x
  3. Step 3: Cross multiply
    258,756.28x = 388,134.39 × 71,767.78
  4. Step 4: Simplify right side
    258,756.28x = 27,855,543,511.95
  5. Step 5: Solve for x
    x = 27,855,543,511.95/258,756.28
  6. Step 6: Final answer
    x = 107,651.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.