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Finding the Fourth Proportional to 198.15, 297.21 and 53.86

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Solution

The fourth proportional to 198.15, 297.21 and 53.86 is: 80.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.15 : 297.21 = 53.86 : x
  2. Step 2: Convert to fraction form
    198.15/297.21 = 53.86/x
  3. Step 3: Cross multiply
    198.15x = 297.21 × 53.86
  4. Step 4: Simplify right side
    198.15x = 16,007.46
  5. Step 5: Solve for x
    x = 16,007.46/198.15
  6. Step 6: Final answer
    x = 80.78

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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.