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Finding the Fourth Proportional to 513.75, 769.20 and 266.43

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Solution

The fourth proportional to 513.75, 769.20 and 266.43 is: 398.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.75 : 769.20 = 266.43 : x
  2. Step 2: Convert to fraction form
    513.75/769.20 = 266.43/x
  3. Step 3: Cross multiply
    513.75x = 769.20 × 266.43
  4. Step 4: Simplify right side
    513.75x = 204,937.96
  5. Step 5: Solve for x
    x = 204,937.96/513.75
  6. Step 6: Final answer
    x = 398.91

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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.