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Finding the Fourth Proportional to 198.55, 274.04 and 115.68

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Solution

The fourth proportional to 198.55, 274.04 and 115.68 is: 159.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.55 : 274.04 = 115.68 : x
  2. Step 2: Convert to fraction form
    198.55/274.04 = 115.68/x
  3. Step 3: Cross multiply
    198.55x = 274.04 × 115.68
  4. Step 4: Simplify right side
    198.55x = 31,700.95
  5. Step 5: Solve for x
    x = 31,700.95/198.55
  6. Step 6: Final answer
    x = 159.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.