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Finding the Fourth Proportional to 197.18, 272.12 and 109.86

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Solution

The fourth proportional to 197.18, 272.12 and 109.86 is: 151.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.18 : 272.12 = 109.86 : x
  2. Step 2: Convert to fraction form
    197.18/272.12 = 109.86/x
  3. Step 3: Cross multiply
    197.18x = 272.12 × 109.86
  4. Step 4: Simplify right side
    197.18x = 29,894.55
  5. Step 5: Solve for x
    x = 29,894.55/197.18
  6. Step 6: Final answer
    x = 151.61

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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.