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Finding the Fourth Proportional to 197.46, 272.43 and 138.47

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Solution

The fourth proportional to 197.46, 272.43 and 138.47 is: 191.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.46 : 272.43 = 138.47 : x
  2. Step 2: Convert to fraction form
    197.46/272.43 = 138.47/x
  3. Step 3: Cross multiply
    197.46x = 272.43 × 138.47
  4. Step 4: Simplify right side
    197.46x = 37,723.38
  5. Step 5: Solve for x
    x = 37,723.38/197.46
  6. Step 6: Final answer
    x = 191.04

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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.