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Finding the Fourth Proportional to 198.80, 297.88 and 126.52

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Solution

The fourth proportional to 198.80, 297.88 and 126.52 is: 189.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.80 : 297.88 = 126.52 : x
  2. Step 2: Convert to fraction form
    198.80/297.88 = 126.52/x
  3. Step 3: Cross multiply
    198.80x = 297.88 × 126.52
  4. Step 4: Simplify right side
    198.80x = 37,687.78
  5. Step 5: Solve for x
    x = 37,687.78/198.80
  6. Step 6: Final answer
    x = 189.58

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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.