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Finding the Fourth Proportional to 126.80, 174.90 and 122.57

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Solution

The fourth proportional to 126.80, 174.90 and 122.57 is: 169.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.80 : 174.90 = 122.57 : x
  2. Step 2: Convert to fraction form
    126.80/174.90 = 122.57/x
  3. Step 3: Cross multiply
    126.80x = 174.90 × 122.57
  4. Step 4: Simplify right side
    126.80x = 21,436.44
  5. Step 5: Solve for x
    x = 21,436.44/126.80
  6. Step 6: Final answer
    x = 169.05

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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.