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Finding the Fourth Proportional to 269.86, 404.81 and 115.78

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Solution

The fourth proportional to 269.86, 404.81 and 115.78 is: 173.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.86 : 404.81 = 115.78 : x
  2. Step 2: Convert to fraction form
    269.86/404.81 = 115.78/x
  3. Step 3: Cross multiply
    269.86x = 404.81 × 115.78
  4. Step 4: Simplify right side
    269.86x = 46,868.90
  5. Step 5: Solve for x
    x = 46,868.90/269.86
  6. Step 6: Final answer
    x = 173.68

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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.