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Finding the Fourth Proportional to 512.75, 768.75 and 204.51

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Solution

The fourth proportional to 512.75, 768.75 and 204.51 is: 306.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.75 : 768.75 = 204.51 : x
  2. Step 2: Convert to fraction form
    512.75/768.75 = 204.51/x
  3. Step 3: Cross multiply
    512.75x = 768.75 × 204.51
  4. Step 4: Simplify right side
    512.75x = 157,212.20
  5. Step 5: Solve for x
    x = 157,212.20/512.75
  6. Step 6: Final answer
    x = 306.61

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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.