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Finding the Fourth Proportional to 198.42, 297.30 and 121.15

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Solution

The fourth proportional to 198.42, 297.30 and 121.15 is: 181.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.42 : 297.30 = 121.15 : x
  2. Step 2: Convert to fraction form
    198.42/297.30 = 121.15/x
  3. Step 3: Cross multiply
    198.42x = 297.30 × 121.15
  4. Step 4: Simplify right side
    198.42x = 36,017.90
  5. Step 5: Solve for x
    x = 36,017.90/198.42
  6. Step 6: Final answer
    x = 181.52

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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.