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Finding the Fourth Proportional to 198.97, 274.68 and 136.91

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Solution

The fourth proportional to 198.97, 274.68 and 136.91 is: 189.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.97 : 274.68 = 136.91 : x
  2. Step 2: Convert to fraction form
    198.97/274.68 = 136.91/x
  3. Step 3: Cross multiply
    198.97x = 274.68 × 136.91
  4. Step 4: Simplify right side
    198.97x = 37,606.44
  5. Step 5: Solve for x
    x = 37,606.44/198.97
  6. Step 6: Final answer
    x = 189.01

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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.