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Finding the Fourth Proportional to 126.75, 174.98 and 122.19

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Solution

The fourth proportional to 126.75, 174.98 and 122.19 is: 168.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.75 : 174.98 = 122.19 : x
  2. Step 2: Convert to fraction form
    126.75/174.98 = 122.19/x
  3. Step 3: Cross multiply
    126.75x = 174.98 × 122.19
  4. Step 4: Simplify right side
    126.75x = 21,380.20
  5. Step 5: Solve for x
    x = 21,380.20/126.75
  6. Step 6: Final answer
    x = 168.68

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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.