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Finding the Fourth Proportional to 392.14, 540.61 and 281.42

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Solution

The fourth proportional to 392.14, 540.61 and 281.42 is: 387.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.14 : 540.61 = 281.42 : x
  2. Step 2: Convert to fraction form
    392.14/540.61 = 281.42/x
  3. Step 3: Cross multiply
    392.14x = 540.61 × 281.42
  4. Step 4: Simplify right side
    392.14x = 152,138.47
  5. Step 5: Solve for x
    x = 152,138.47/392.14
  6. Step 6: Final answer
    x = 387.97

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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.