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Finding the Fourth Proportional to 126.78, 190.02 and 71.96

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Solution

The fourth proportional to 126.78, 190.02 and 71.96 is: 107.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.78 : 190.02 = 71.96 : x
  2. Step 2: Convert to fraction form
    126.78/190.02 = 71.96/x
  3. Step 3: Cross multiply
    126.78x = 190.02 × 71.96
  4. Step 4: Simplify right side
    126.78x = 13,673.84
  5. Step 5: Solve for x
    x = 13,673.84/126.78
  6. Step 6: Final answer
    x = 107.85

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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.