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Finding the Fourth Proportional to 197.20, 272.13 and 109.89

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Solution

The fourth proportional to 197.20, 272.13 and 109.89 is: 151.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.20 : 272.13 = 109.89 : x
  2. Step 2: Convert to fraction form
    197.20/272.13 = 109.89/x
  3. Step 3: Cross multiply
    197.20x = 272.13 × 109.89
  4. Step 4: Simplify right side
    197.20x = 29,903.01
  5. Step 5: Solve for x
    x = 29,903.01/197.20
  6. Step 6: Final answer
    x = 151.64

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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.