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Finding the Fourth Proportional to 197.81, 296.74 and 82.18

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Solution

The fourth proportional to 197.81, 296.74 and 82.18 is: 123.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.81 : 296.74 = 82.18 : x
  2. Step 2: Convert to fraction form
    197.81/296.74 = 82.18/x
  3. Step 3: Cross multiply
    197.81x = 296.74 × 82.18
  4. Step 4: Simplify right side
    197.81x = 24,387.09
  5. Step 5: Solve for x
    x = 24,387.09/197.81
  6. Step 6: Final answer
    x = 123.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.