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Finding the Fourth Proportional to 411.31, 567.69 and 280.22

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Solution

The fourth proportional to 411.31, 567.69 and 280.22 is: 386.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.31 : 567.69 = 280.22 : x
  2. Step 2: Convert to fraction form
    411.31/567.69 = 280.22/x
  3. Step 3: Cross multiply
    411.31x = 567.69 × 280.22
  4. Step 4: Simplify right side
    411.31x = 159,078.09
  5. Step 5: Solve for x
    x = 159,078.09/411.31
  6. Step 6: Final answer
    x = 386.76

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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.