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Finding the Fourth Proportional to 126.91, 190.21 and 111.45

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Solution

The fourth proportional to 126.91, 190.21 and 111.45 is: 167.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.91 : 190.21 = 111.45 : x
  2. Step 2: Convert to fraction form
    126.91/190.21 = 111.45/x
  3. Step 3: Cross multiply
    126.91x = 190.21 × 111.45
  4. Step 4: Simplify right side
    126.91x = 21,198.90
  5. Step 5: Solve for x
    x = 21,198.90/126.91
  6. Step 6: Final answer
    x = 167.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.