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Finding the Fourth Proportional to 197.68, 272.66 and 155.61

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Solution

The fourth proportional to 197.68, 272.66 and 155.61 is: 214.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.68 : 272.66 = 155.61 : x
  2. Step 2: Convert to fraction form
    197.68/272.66 = 155.61/x
  3. Step 3: Cross multiply
    197.68x = 272.66 × 155.61
  4. Step 4: Simplify right side
    197.68x = 42,428.28
  5. Step 5: Solve for x
    x = 42,428.28/197.68
  6. Step 6: Final answer
    x = 214.63

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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.