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Finding the Fourth Proportional to 512.31, 768 and 426.35

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Solution

The fourth proportional to 512.31, 768 and 426.35 is: 639.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.31 : 768 = 426.35 : x
  2. Step 2: Convert to fraction form
    512.31/768 = 426.35/x
  3. Step 3: Cross multiply
    512.31x = 768 × 426.35
  4. Step 4: Simplify right side
    512.31x = 327,436.80
  5. Step 5: Solve for x
    x = 327,436.80/512.31
  6. Step 6: Final answer
    x = 639.14

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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.