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Finding the Fourth Proportional to 197.31, 272.03 and 138.20

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Solution

The fourth proportional to 197.31, 272.03 and 138.20 is: 190.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.31 : 272.03 = 138.20 : x
  2. Step 2: Convert to fraction form
    197.31/272.03 = 138.20/x
  3. Step 3: Cross multiply
    197.31x = 272.03 × 138.20
  4. Step 4: Simplify right side
    197.31x = 37,592.49
  5. Step 5: Solve for x
    x = 37,592.49/197.31
  6. Step 6: Final answer
    x = 190.53

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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.