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Finding the Fourth Proportional to 198.75, 274.28 and 129.87

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Solution

The fourth proportional to 198.75, 274.28 and 129.87 is: 179.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.75 : 274.28 = 129.87 : x
  2. Step 2: Convert to fraction form
    198.75/274.28 = 129.87/x
  3. Step 3: Cross multiply
    198.75x = 274.28 × 129.87
  4. Step 4: Simplify right side
    198.75x = 35,620.09
  5. Step 5: Solve for x
    x = 35,620.09/198.75
  6. Step 6: Final answer
    x = 179.22

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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.