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Finding the Fourth Proportional to 198.36, 297.52 and 121.40

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Solution

The fourth proportional to 198.36, 297.52 and 121.40 is: 182.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.36 : 297.52 = 121.40 : x
  2. Step 2: Convert to fraction form
    198.36/297.52 = 121.40/x
  3. Step 3: Cross multiply
    198.36x = 297.52 × 121.40
  4. Step 4: Simplify right side
    198.36x = 36,118.93
  5. Step 5: Solve for x
    x = 36,118.93/198.36
  6. Step 6: Final answer
    x = 182.09

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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.