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Finding the Fourth Proportional to 197.11, 272.02 and 109.78

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Solution

The fourth proportional to 197.11, 272.02 and 109.78 is: 151.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.11 : 272.02 = 109.78 : x
  2. Step 2: Convert to fraction form
    197.11/272.02 = 109.78/x
  3. Step 3: Cross multiply
    197.11x = 272.02 × 109.78
  4. Step 4: Simplify right side
    197.11x = 29,862.83
  5. Step 5: Solve for x
    x = 29,862.83/197.11
  6. Step 6: Final answer
    x = 151.50

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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.