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Finding the Fourth Proportional to 517.72, 775.82 and 408.29

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Solution

The fourth proportional to 517.72, 775.82 and 408.29 is: 611.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.72 : 775.82 = 408.29 : x
  2. Step 2: Convert to fraction form
    517.72/775.82 = 408.29/x
  3. Step 3: Cross multiply
    517.72x = 775.82 × 408.29
  4. Step 4: Simplify right side
    517.72x = 316,759.55
  5. Step 5: Solve for x
    x = 316,759.55/517.72
  6. Step 6: Final answer
    x = 611.84

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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.