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Finding the Fourth Proportional to 197.52, 272.68 and 139.68

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Solution

The fourth proportional to 197.52, 272.68 and 139.68 is: 192.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.52 : 272.68 = 139.68 : x
  2. Step 2: Convert to fraction form
    197.52/272.68 = 139.68/x
  3. Step 3: Cross multiply
    197.52x = 272.68 × 139.68
  4. Step 4: Simplify right side
    197.52x = 38,087.94
  5. Step 5: Solve for x
    x = 38,087.94/197.52
  6. Step 6: Final answer
    x = 192.83

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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.