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Finding the Fourth Proportional to 198.65, 297.84 and 81.47

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Solution

The fourth proportional to 198.65, 297.84 and 81.47 is: 122.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.65 : 297.84 = 81.47 : x
  2. Step 2: Convert to fraction form
    198.65/297.84 = 81.47/x
  3. Step 3: Cross multiply
    198.65x = 297.84 × 81.47
  4. Step 4: Simplify right side
    198.65x = 24,266.07
  5. Step 5: Solve for x
    x = 24,266.07/198.65
  6. Step 6: Final answer
    x = 122.15

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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.