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Finding the Fourth Proportional to 386.14, 579.42 and 280.61

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Solution

The fourth proportional to 386.14, 579.42 and 280.61 is: 421.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.14 : 579.42 = 280.61 : x
  2. Step 2: Convert to fraction form
    386.14/579.42 = 280.61/x
  3. Step 3: Cross multiply
    386.14x = 579.42 × 280.61
  4. Step 4: Simplify right side
    386.14x = 162,591.44
  5. Step 5: Solve for x
    x = 162,591.44/386.14
  6. Step 6: Final answer
    x = 421.07

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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.