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Finding the Fourth Proportional to 198.44, 297.80 and 107.20

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Solution

The fourth proportional to 198.44, 297.80 and 107.20 is: 160.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.44 : 297.80 = 107.20 : x
  2. Step 2: Convert to fraction form
    198.44/297.80 = 107.20/x
  3. Step 3: Cross multiply
    198.44x = 297.80 × 107.20
  4. Step 4: Simplify right side
    198.44x = 31,924.16
  5. Step 5: Solve for x
    x = 31,924.16/198.44
  6. Step 6: Final answer
    x = 160.88

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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.