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Finding the Fourth Proportional to 269.78, 404.70 and 87.18

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Solution

The fourth proportional to 269.78, 404.70 and 87.18 is: 130.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.78 : 404.70 = 87.18 : x
  2. Step 2: Convert to fraction form
    269.78/404.70 = 87.18/x
  3. Step 3: Cross multiply
    269.78x = 404.70 × 87.18
  4. Step 4: Simplify right side
    269.78x = 35,281.75
  5. Step 5: Solve for x
    x = 35,281.75/269.78
  6. Step 6: Final answer
    x = 130.78

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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.