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Finding the Fourth Proportional to 198.15, 297.38 and 121.29

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Solution

The fourth proportional to 198.15, 297.38 and 121.29 is: 182.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.15 : 297.38 = 121.29 : x
  2. Step 2: Convert to fraction form
    198.15/297.38 = 121.29/x
  3. Step 3: Cross multiply
    198.15x = 297.38 × 121.29
  4. Step 4: Simplify right side
    198.15x = 36,069.22
  5. Step 5: Solve for x
    x = 36,069.22/198.15
  6. Step 6: Final answer
    x = 182.03

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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.