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Finding the Fourth Proportional to 126.12, 173.21 and 107.70

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Solution

The fourth proportional to 126.12, 173.21 and 107.70 is: 147.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.12 : 173.21 = 107.70 : x
  2. Step 2: Convert to fraction form
    126.12/173.21 = 107.70/x
  3. Step 3: Cross multiply
    126.12x = 173.21 × 107.70
  4. Step 4: Simplify right side
    126.12x = 18,654.18
  5. Step 5: Solve for x
    x = 18,654.18/126.12
  6. Step 6: Final answer
    x = 147.91

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.