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Finding the Fourth Proportional to 439.28, 605.90 and 281.92

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Solution

The fourth proportional to 439.28, 605.90 and 281.92 is: 388.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.28 : 605.90 = 281.92 : x
  2. Step 2: Convert to fraction form
    439.28/605.90 = 281.92/x
  3. Step 3: Cross multiply
    439.28x = 605.90 × 281.92
  4. Step 4: Simplify right side
    439.28x = 170,810.89
  5. Step 5: Solve for x
    x = 170,810.89/439.28
  6. Step 6: Final answer
    x = 388.84

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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.