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Finding the Fourth Proportional to 126.81, 189.23 and 113.18

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Solution

The fourth proportional to 126.81, 189.23 and 113.18 is: 168.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.81 : 189.23 = 113.18 : x
  2. Step 2: Convert to fraction form
    126.81/189.23 = 113.18/x
  3. Step 3: Cross multiply
    126.81x = 189.23 × 113.18
  4. Step 4: Simplify right side
    126.81x = 21,415.54
  5. Step 5: Solve for x
    x = 21,415.54/126.81
  6. Step 6: Final answer
    x = 168.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.