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Finding the Fourth Proportional to 196.92, 271.89 and 138.87

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Solution

The fourth proportional to 196.92, 271.89 and 138.87 is: 191.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.92 : 271.89 = 138.87 : x
  2. Step 2: Convert to fraction form
    196.92/271.89 = 138.87/x
  3. Step 3: Cross multiply
    196.92x = 271.89 × 138.87
  4. Step 4: Simplify right side
    196.92x = 37,757.36
  5. Step 5: Solve for x
    x = 37,757.36/196.92
  6. Step 6: Final answer
    x = 191.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.