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Finding the Fourth Proportional to 198.87, 274.16 and 136.60

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Solution

The fourth proportional to 198.87, 274.16 and 136.60 is: 188.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.87 : 274.16 = 136.60 : x
  2. Step 2: Convert to fraction form
    198.87/274.16 = 136.60/x
  3. Step 3: Cross multiply
    198.87x = 274.16 × 136.60
  4. Step 4: Simplify right side
    198.87x = 37,448.20
  5. Step 5: Solve for x
    x = 37,448.20/198.87
  6. Step 6: Final answer
    x = 188.31

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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.