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Finding the Fourth Proportional to 197.82, 296.56 and 128.48

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Solution

The fourth proportional to 197.82, 296.56 and 128.48 is: 192.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.82 : 296.56 = 128.48 : x
  2. Step 2: Convert to fraction form
    197.82/296.56 = 128.48/x
  3. Step 3: Cross multiply
    197.82x = 296.56 × 128.48
  4. Step 4: Simplify right side
    197.82x = 38,100.55
  5. Step 5: Solve for x
    x = 38,100.55/197.82
  6. Step 6: Final answer
    x = 192.61

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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.