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Finding the Fourth Proportional to 412.20, 568.38 and 281.28

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Solution

The fourth proportional to 412.20, 568.38 and 281.28 is: 387.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.20 : 568.38 = 281.28 : x
  2. Step 2: Convert to fraction form
    412.20/568.38 = 281.28/x
  3. Step 3: Cross multiply
    412.20x = 568.38 × 281.28
  4. Step 4: Simplify right side
    412.20x = 159,873.93
  5. Step 5: Solve for x
    x = 159,873.93/412.20
  6. Step 6: Final answer
    x = 387.86

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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.