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Finding the Fourth Proportional to 197.84, 272.66 and 138.71

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Solution

The fourth proportional to 197.84, 272.66 and 138.71 is: 191.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.84 : 272.66 = 138.71 : x
  2. Step 2: Convert to fraction form
    197.84/272.66 = 138.71/x
  3. Step 3: Cross multiply
    197.84x = 272.66 × 138.71
  4. Step 4: Simplify right side
    197.84x = 37,818.61
  5. Step 5: Solve for x
    x = 37,818.61/197.84
  6. Step 6: Final answer
    x = 191.16

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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.