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Finding the Fourth Proportional to 512.54, 768.79 and 127.79

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Solution

The fourth proportional to 512.54, 768.79 and 127.79 is: 191.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.54 : 768.79 = 127.79 : x
  2. Step 2: Convert to fraction form
    512.54/768.79 = 127.79/x
  3. Step 3: Cross multiply
    512.54x = 768.79 × 127.79
  4. Step 4: Simplify right side
    512.54x = 98,243.67
  5. Step 5: Solve for x
    x = 98,243.67/512.54
  6. Step 6: Final answer
    x = 191.68

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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.