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Finding the Fourth Proportional to 511.53, 768.78 and 425.43

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Solution

The fourth proportional to 511.53, 768.78 and 425.43 is: 639.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.53 : 768.78 = 425.43 : x
  2. Step 2: Convert to fraction form
    511.53/768.78 = 425.43/x
  3. Step 3: Cross multiply
    511.53x = 768.78 × 425.43
  4. Step 4: Simplify right side
    511.53x = 327,062.08
  5. Step 5: Solve for x
    x = 327,062.08/511.53
  6. Step 6: Final answer
    x = 639.38

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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.