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Finding the Fourth Proportional to 126.99, 190.79 and 81.43

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Solution

The fourth proportional to 126.99, 190.79 and 81.43 is: 122.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.99 : 190.79 = 81.43 : x
  2. Step 2: Convert to fraction form
    126.99/190.79 = 81.43/x
  3. Step 3: Cross multiply
    126.99x = 190.79 × 81.43
  4. Step 4: Simplify right side
    126.99x = 15,534.86
  5. Step 5: Solve for x
    x = 15,534.86/126.99
  6. Step 6: Final answer
    x = 122.33

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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.