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Finding the Fourth Proportional to 404.06, 605.48 and 257.85

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Solution

The fourth proportional to 404.06, 605.48 and 257.85 is: 386.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.06 : 605.48 = 257.85 : x
  2. Step 2: Convert to fraction form
    404.06/605.48 = 257.85/x
  3. Step 3: Cross multiply
    404.06x = 605.48 × 257.85
  4. Step 4: Simplify right side
    404.06x = 156,121.73
  5. Step 5: Solve for x
    x = 156,121.73/404.06
  6. Step 6: Final answer
    x = 386.39

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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.