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Finding the Fourth Proportional to 126.15, 173.91 and 107.92

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Solution

The fourth proportional to 126.15, 173.91 and 107.92 is: 148.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.15 : 173.91 = 107.92 : x
  2. Step 2: Convert to fraction form
    126.15/173.91 = 107.92/x
  3. Step 3: Cross multiply
    126.15x = 173.91 × 107.92
  4. Step 4: Simplify right side
    126.15x = 18,768.37
  5. Step 5: Solve for x
    x = 18,768.37/126.15
  6. Step 6: Final answer
    x = 148.78

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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.