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Finding the Fourth Proportional to 127.93, 191.43 and 81.44

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Solution

The fourth proportional to 127.93, 191.43 and 81.44 is: 121.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.93 : 191.43 = 81.44 : x
  2. Step 2: Convert to fraction form
    127.93/191.43 = 81.44/x
  3. Step 3: Cross multiply
    127.93x = 191.43 × 81.44
  4. Step 4: Simplify right side
    127.93x = 15,590.28
  5. Step 5: Solve for x
    x = 15,590.28/127.93
  6. Step 6: Final answer
    x = 121.87

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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.