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Finding the Fourth Proportional to 126.43, 189.61 and 54.29

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Solution

The fourth proportional to 126.43, 189.61 and 54.29 is: 81.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.43 : 189.61 = 54.29 : x
  2. Step 2: Convert to fraction form
    126.43/189.61 = 54.29/x
  3. Step 3: Cross multiply
    126.43x = 189.61 × 54.29
  4. Step 4: Simplify right side
    126.43x = 10,293.93
  5. Step 5: Solve for x
    x = 10,293.93/126.43
  6. Step 6: Final answer
    x = 81.42

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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.