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Finding the Fourth Proportional to 513.78, 771.21 and 225.42

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Solution

The fourth proportional to 513.78, 771.21 and 225.42 is: 338.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.78 : 771.21 = 225.42 : x
  2. Step 2: Convert to fraction form
    513.78/771.21 = 225.42/x
  3. Step 3: Cross multiply
    513.78x = 771.21 × 225.42
  4. Step 4: Simplify right side
    513.78x = 173,846.16
  5. Step 5: Solve for x
    x = 173,846.16/513.78
  6. Step 6: Final answer
    x = 338.37

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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.