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Finding the Fourth Proportional to 198.36, 297.36 and 121.32

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Solution

The fourth proportional to 198.36, 297.36 and 121.32 is: 181.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.36 : 297.36 = 121.32 : x
  2. Step 2: Convert to fraction form
    198.36/297.36 = 121.32/x
  3. Step 3: Cross multiply
    198.36x = 297.36 × 121.32
  4. Step 4: Simplify right side
    198.36x = 36,075.72
  5. Step 5: Solve for x
    x = 36,075.72/198.36
  6. Step 6: Final answer
    x = 181.87

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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.