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Finding the Fourth Proportional to 512.81, 768.75 and 426.85

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Solution

The fourth proportional to 512.81, 768.75 and 426.85 is: 639.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.81 : 768.75 = 426.85 : x
  2. Step 2: Convert to fraction form
    512.81/768.75 = 426.85/x
  3. Step 3: Cross multiply
    512.81x = 768.75 × 426.85
  4. Step 4: Simplify right side
    512.81x = 328,140.94
  5. Step 5: Solve for x
    x = 328,140.94/512.81
  6. Step 6: Final answer
    x = 639.89

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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.