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Finding the Fourth Proportional to 126.92, 189.87 and 113.25

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Solution

The fourth proportional to 126.92, 189.87 and 113.25 is: 169.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.92 : 189.87 = 113.25 : x
  2. Step 2: Convert to fraction form
    126.92/189.87 = 113.25/x
  3. Step 3: Cross multiply
    126.92x = 189.87 × 113.25
  4. Step 4: Simplify right side
    126.92x = 21,502.78
  5. Step 5: Solve for x
    x = 21,502.78/126.92
  6. Step 6: Final answer
    x = 169.42

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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.