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Finding the Fourth Proportional to 198.23, 297.20 and 74.76

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Solution

The fourth proportional to 198.23, 297.20 and 74.76 is: 112.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.23 : 297.20 = 74.76 : x
  2. Step 2: Convert to fraction form
    198.23/297.20 = 74.76/x
  3. Step 3: Cross multiply
    198.23x = 297.20 × 74.76
  4. Step 4: Simplify right side
    198.23x = 22,218.30
  5. Step 5: Solve for x
    x = 22,218.30/198.23
  6. Step 6: Final answer
    x = 112.09

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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.