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Finding the Fourth Proportional to 126.97, 190.15 and 105.40

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Solution

The fourth proportional to 126.97, 190.15 and 105.40 is: 157.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.97 : 190.15 = 105.40 : x
  2. Step 2: Convert to fraction form
    126.97/190.15 = 105.40/x
  3. Step 3: Cross multiply
    126.97x = 190.15 × 105.40
  4. Step 4: Simplify right side
    126.97x = 20,041.78
  5. Step 5: Solve for x
    x = 20,041.78/126.97
  6. Step 6: Final answer
    x = 157.85

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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.