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Finding the Fourth Proportional to 197.78, 272.96 and 124.20

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Solution

The fourth proportional to 197.78, 272.96 and 124.20 is: 171.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.78 : 272.96 = 124.20 : x
  2. Step 2: Convert to fraction form
    197.78/272.96 = 124.20/x
  3. Step 3: Cross multiply
    197.78x = 272.96 × 124.20
  4. Step 4: Simplify right side
    197.78x = 33,901.48
  5. Step 5: Solve for x
    x = 33,901.48/197.78
  6. Step 6: Final answer
    x = 171.41

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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.