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Finding the Fourth Proportional to 197.22, 271.98 and 138.90

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Solution

The fourth proportional to 197.22, 271.98 and 138.90 is: 191.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.22 : 271.98 = 138.90 : x
  2. Step 2: Convert to fraction form
    197.22/271.98 = 138.90/x
  3. Step 3: Cross multiply
    197.22x = 271.98 × 138.90
  4. Step 4: Simplify right side
    197.22x = 37,778.02
  5. Step 5: Solve for x
    x = 37,778.02/197.22
  6. Step 6: Final answer
    x = 191.55

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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.