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Finding the Fourth Proportional to 197.20, 271.69 and 155.74

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Solution

The fourth proportional to 197.20, 271.69 and 155.74 is: 214.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.20 : 271.69 = 155.74 : x
  2. Step 2: Convert to fraction form
    197.20/271.69 = 155.74/x
  3. Step 3: Cross multiply
    197.20x = 271.69 × 155.74
  4. Step 4: Simplify right side
    197.20x = 42,311.93
  5. Step 5: Solve for x
    x = 42,311.93/197.20
  6. Step 6: Final answer
    x = 214.57

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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.