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Finding the Fourth Proportional to 126.81, 190.52 and 81.25

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Solution

The fourth proportional to 126.81, 190.52 and 81.25 is: 122.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.81 : 190.52 = 81.25 : x
  2. Step 2: Convert to fraction form
    126.81/190.52 = 81.25/x
  3. Step 3: Cross multiply
    126.81x = 190.52 × 81.25
  4. Step 4: Simplify right side
    126.81x = 15,479.90
  5. Step 5: Solve for x
    x = 15,479.90/126.81
  6. Step 6: Final answer
    x = 122.07

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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.