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Finding the Fourth Proportional to 198.19, 297.10 and 76.38

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Solution

The fourth proportional to 198.19, 297.10 and 76.38 is: 114.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.19 : 297.10 = 76.38 : x
  2. Step 2: Convert to fraction form
    198.19/297.10 = 76.38/x
  3. Step 3: Cross multiply
    198.19x = 297.10 × 76.38
  4. Step 4: Simplify right side
    198.19x = 22,692.50
  5. Step 5: Solve for x
    x = 22,692.50/198.19
  6. Step 6: Final answer
    x = 114.50

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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.