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Finding the Fourth Proportional to 513.38, 769.85 and 221.01

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Solution

The fourth proportional to 513.38, 769.85 and 221.01 is: 331.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.38 : 769.85 = 221.01 : x
  2. Step 2: Convert to fraction form
    513.38/769.85 = 221.01/x
  3. Step 3: Cross multiply
    513.38x = 769.85 × 221.01
  4. Step 4: Simplify right side
    513.38x = 170,143.44
  5. Step 5: Solve for x
    x = 170,143.44/513.38
  6. Step 6: Final answer
    x = 331.42

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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.