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Finding the Fourth Proportional to 197.78, 272.94 and 124.08

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Solution

The fourth proportional to 197.78, 272.94 and 124.08 is: 171.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.78 : 272.94 = 124.08 : x
  2. Step 2: Convert to fraction form
    197.78/272.94 = 124.08/x
  3. Step 3: Cross multiply
    197.78x = 272.94 × 124.08
  4. Step 4: Simplify right side
    197.78x = 33,866.40
  5. Step 5: Solve for x
    x = 33,866.40/197.78
  6. Step 6: Final answer
    x = 171.23

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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.