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Finding the Fourth Proportional to 126.14, 174.96 and 121.28

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Solution

The fourth proportional to 126.14, 174.96 and 121.28 is: 168.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.14 : 174.96 = 121.28 : x
  2. Step 2: Convert to fraction form
    126.14/174.96 = 121.28/x
  3. Step 3: Cross multiply
    126.14x = 174.96 × 121.28
  4. Step 4: Simplify right side
    126.14x = 21,218.27
  5. Step 5: Solve for x
    x = 21,218.27/126.14
  6. Step 6: Final answer
    x = 168.22

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.