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Finding the Fourth Proportional to 198.11, 297 and 120.98

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Solution

The fourth proportional to 198.11, 297 and 120.98 is: 181.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.11 : 297 = 120.98 : x
  2. Step 2: Convert to fraction form
    198.11/297 = 120.98/x
  3. Step 3: Cross multiply
    198.11x = 297 × 120.98
  4. Step 4: Simplify right side
    198.11x = 35,931.06
  5. Step 5: Solve for x
    x = 35,931.06/198.11
  6. Step 6: Final answer
    x = 181.37

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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.