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Finding the Fourth Proportional to 126.20, 188.55 and 107

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Solution

The fourth proportional to 126.20, 188.55 and 107 is: 159.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.20 : 188.55 = 107 : x
  2. Step 2: Convert to fraction form
    126.20/188.55 = 107/x
  3. Step 3: Cross multiply
    126.20x = 188.55 × 107
  4. Step 4: Simplify right side
    126.20x = 20,174.85
  5. Step 5: Solve for x
    x = 20,174.85/126.20
  6. Step 6: Final answer
    x = 159.86

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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.