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Finding the Fourth Proportional to 198.50, 297.72 and 187.20

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Solution

The fourth proportional to 198.50, 297.72 and 187.20 is: 280.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.50 : 297.72 = 187.20 : x
  2. Step 2: Convert to fraction form
    198.50/297.72 = 187.20/x
  3. Step 3: Cross multiply
    198.50x = 297.72 × 187.20
  4. Step 4: Simplify right side
    198.50x = 55,733.18
  5. Step 5: Solve for x
    x = 55,733.18/198.50
  6. Step 6: Final answer
    x = 280.78

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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.