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Finding the Fourth Proportional to 126.81, 190.59 and 105.28

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Solution

The fourth proportional to 126.81, 190.59 and 105.28 is: 158.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.81 : 190.59 = 105.28 : x
  2. Step 2: Convert to fraction form
    126.81/190.59 = 105.28/x
  3. Step 3: Cross multiply
    126.81x = 190.59 × 105.28
  4. Step 4: Simplify right side
    126.81x = 20,064.44
  5. Step 5: Solve for x
    x = 20,064.44/126.81
  6. Step 6: Final answer
    x = 158.22

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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.