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Finding the Fourth Proportional to 197.70, 272.73 and 126.78

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Solution

The fourth proportional to 197.70, 272.73 and 126.78 is: 174.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.70 : 272.73 = 126.78 : x
  2. Step 2: Convert to fraction form
    197.70/272.73 = 126.78/x
  3. Step 3: Cross multiply
    197.70x = 272.73 × 126.78
  4. Step 4: Simplify right side
    197.70x = 34,576.71
  5. Step 5: Solve for x
    x = 34,576.71/197.70
  6. Step 6: Final answer
    x = 174.89

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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.