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Finding the Fourth Proportional to 520.82, 781.31 and 260.82

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Solution

The fourth proportional to 520.82, 781.31 and 260.82 is: 391.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.82 : 781.31 = 260.82 : x
  2. Step 2: Convert to fraction form
    520.82/781.31 = 260.82/x
  3. Step 3: Cross multiply
    520.82x = 781.31 × 260.82
  4. Step 4: Simplify right side
    520.82x = 203,779.97
  5. Step 5: Solve for x
    x = 203,779.97/520.82
  6. Step 6: Final answer
    x = 391.27

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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.