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Finding the Fourth Proportional to 126.83, 189.94 and 81.04

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Solution

The fourth proportional to 126.83, 189.94 and 81.04 is: 121.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.83 : 189.94 = 81.04 : x
  2. Step 2: Convert to fraction form
    126.83/189.94 = 81.04/x
  3. Step 3: Cross multiply
    126.83x = 189.94 × 81.04
  4. Step 4: Simplify right side
    126.83x = 15,392.74
  5. Step 5: Solve for x
    x = 15,392.74/126.83
  6. Step 6: Final answer
    x = 121.37

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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.