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Finding the Fourth Proportional to 198.59, 297.72 and 121.54

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Solution

The fourth proportional to 198.59, 297.72 and 121.54 is: 182.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.59 : 297.72 = 121.54 : x
  2. Step 2: Convert to fraction form
    198.59/297.72 = 121.54/x
  3. Step 3: Cross multiply
    198.59x = 297.72 × 121.54
  4. Step 4: Simplify right side
    198.59x = 36,183.40
  5. Step 5: Solve for x
    x = 36,183.40/198.59
  6. Step 6: Final answer
    x = 182.21

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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.