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Finding the Fourth Proportional to 198.80, 297.72 and 112.88

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Solution

The fourth proportional to 198.80, 297.72 and 112.88 is: 169.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.80 : 297.72 = 112.88 : x
  2. Step 2: Convert to fraction form
    198.80/297.72 = 112.88/x
  3. Step 3: Cross multiply
    198.80x = 297.72 × 112.88
  4. Step 4: Simplify right side
    198.80x = 33,606.63
  5. Step 5: Solve for x
    x = 33,606.63/198.80
  6. Step 6: Final answer
    x = 169.05

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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.