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Finding the Fourth Proportional to 269.44, 404.19 and 86.80

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Solution

The fourth proportional to 269.44, 404.19 and 86.80 is: 130.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.44 : 404.19 = 86.80 : x
  2. Step 2: Convert to fraction form
    269.44/404.19 = 86.80/x
  3. Step 3: Cross multiply
    269.44x = 404.19 × 86.80
  4. Step 4: Simplify right side
    269.44x = 35,083.69
  5. Step 5: Solve for x
    x = 35,083.69/269.44
  6. Step 6: Final answer
    x = 130.21

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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.