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Finding the Fourth Proportional to 126.79, 190.19 and 30.61

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Solution

The fourth proportional to 126.79, 190.19 and 30.61 is: 45.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.79 : 190.19 = 30.61 : x
  2. Step 2: Convert to fraction form
    126.79/190.19 = 30.61/x
  3. Step 3: Cross multiply
    126.79x = 190.19 × 30.61
  4. Step 4: Simplify right side
    126.79x = 5,821.11
  5. Step 5: Solve for x
    x = 5,821.11/126.79
  6. Step 6: Final answer
    x = 45.91

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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.