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Finding the Fourth Proportional to 539.70, 809.22 and 261.96

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Solution

The fourth proportional to 539.70, 809.22 and 261.96 is: 392.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.70 : 809.22 = 261.96 : x
  2. Step 2: Convert to fraction form
    539.70/809.22 = 261.96/x
  3. Step 3: Cross multiply
    539.70x = 809.22 × 261.96
  4. Step 4: Simplify right side
    539.70x = 211,983.27
  5. Step 5: Solve for x
    x = 211,983.27/539.70
  6. Step 6: Final answer
    x = 392.78

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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.