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Finding the Fourth Proportional to 127.78, 191.60 and 82

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Solution

The fourth proportional to 127.78, 191.60 and 82 is: 122.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.78 : 191.60 = 82 : x
  2. Step 2: Convert to fraction form
    127.78/191.60 = 82/x
  3. Step 3: Cross multiply
    127.78x = 191.60 × 82
  4. Step 4: Simplify right side
    127.78x = 15,711.20
  5. Step 5: Solve for x
    x = 15,711.20/127.78
  6. Step 6: Final answer
    x = 122.96

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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.