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Finding the Fourth Proportional to 126.75, 188.68 and 120.85

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Solution

The fourth proportional to 126.75, 188.68 and 120.85 is: 179.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.75 : 188.68 = 120.85 : x
  2. Step 2: Convert to fraction form
    126.75/188.68 = 120.85/x
  3. Step 3: Cross multiply
    126.75x = 188.68 × 120.85
  4. Step 4: Simplify right side
    126.75x = 22,801.98
  5. Step 5: Solve for x
    x = 22,801.98/126.75
  6. Step 6: Final answer
    x = 179.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.