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Finding the Fourth Proportional to 197.45, 296.28 and 81.87

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Solution

The fourth proportional to 197.45, 296.28 and 81.87 is: 122.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.45 : 296.28 = 81.87 : x
  2. Step 2: Convert to fraction form
    197.45/296.28 = 81.87/x
  3. Step 3: Cross multiply
    197.45x = 296.28 × 81.87
  4. Step 4: Simplify right side
    197.45x = 24,256.44
  5. Step 5: Solve for x
    x = 24,256.44/197.45
  6. Step 6: Final answer
    x = 122.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.