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Finding the Fourth Proportional to 126.66, 173.40 and 123.42

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Solution

The fourth proportional to 126.66, 173.40 and 123.42 is: 168.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.66 : 173.40 = 123.42 : x
  2. Step 2: Convert to fraction form
    126.66/173.40 = 123.42/x
  3. Step 3: Cross multiply
    126.66x = 173.40 × 123.42
  4. Step 4: Simplify right side
    126.66x = 21,401.03
  5. Step 5: Solve for x
    x = 21,401.03/126.66
  6. Step 6: Final answer
    x = 168.96

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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.