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Finding the Fourth Proportional to 512.42, 768.65 and 127.68

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Solution

The fourth proportional to 512.42, 768.65 and 127.68 is: 191.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.42 : 768.65 = 127.68 : x
  2. Step 2: Convert to fraction form
    512.42/768.65 = 127.68/x
  3. Step 3: Cross multiply
    512.42x = 768.65 × 127.68
  4. Step 4: Simplify right side
    512.42x = 98,141.23
  5. Step 5: Solve for x
    x = 98,141.23/512.42
  6. Step 6: Final answer
    x = 191.52

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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.