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Finding the Fourth Proportional to 197.09, 271.91 and 118.42

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Solution

The fourth proportional to 197.09, 271.91 and 118.42 is: 163.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.09 : 271.91 = 118.42 : x
  2. Step 2: Convert to fraction form
    197.09/271.91 = 118.42/x
  3. Step 3: Cross multiply
    197.09x = 271.91 × 118.42
  4. Step 4: Simplify right side
    197.09x = 32,199.58
  5. Step 5: Solve for x
    x = 32,199.58/197.09
  6. Step 6: Final answer
    x = 163.38

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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.