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Finding the Fourth Proportional to 439.20, 605.75 and 281.79

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Solution

The fourth proportional to 439.20, 605.75 and 281.79 is: 388.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.20 : 605.75 = 281.79 : x
  2. Step 2: Convert to fraction form
    439.20/605.75 = 281.79/x
  3. Step 3: Cross multiply
    439.20x = 605.75 × 281.79
  4. Step 4: Simplify right side
    439.20x = 170,692.88
  5. Step 5: Solve for x
    x = 170,692.88/439.20
  6. Step 6: Final answer
    x = 388.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.