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Finding the Fourth Proportional to 126.21, 173.04 and 123.78

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Solution

The fourth proportional to 126.21, 173.04 and 123.78 is: 169.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.21 : 173.04 = 123.78 : x
  2. Step 2: Convert to fraction form
    126.21/173.04 = 123.78/x
  3. Step 3: Cross multiply
    126.21x = 173.04 × 123.78
  4. Step 4: Simplify right side
    126.21x = 21,418.89
  5. Step 5: Solve for x
    x = 21,418.89/126.21
  6. Step 6: Final answer
    x = 169.71

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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.