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Finding the Fourth Proportional to 198.63, 297.55 and 136.78

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Solution

The fourth proportional to 198.63, 297.55 and 136.78 is: 204.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.63 : 297.55 = 136.78 : x
  2. Step 2: Convert to fraction form
    198.63/297.55 = 136.78/x
  3. Step 3: Cross multiply
    198.63x = 297.55 × 136.78
  4. Step 4: Simplify right side
    198.63x = 40,697.80
  5. Step 5: Solve for x
    x = 40,697.80/198.63
  6. Step 6: Final answer
    x = 204.89

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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.