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Finding the Fourth Proportional to 198.51, 297.69 and 75.09

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Solution

The fourth proportional to 198.51, 297.69 and 75.09 is: 112.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.51 : 297.69 = 75.09 : x
  2. Step 2: Convert to fraction form
    198.51/297.69 = 75.09/x
  3. Step 3: Cross multiply
    198.51x = 297.69 × 75.09
  4. Step 4: Simplify right side
    198.51x = 22,353.54
  5. Step 5: Solve for x
    x = 22,353.54/198.51
  6. Step 6: Final answer
    x = 112.61

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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.