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Finding the Fourth Proportional to 126.91, 190.46 and 49.89

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Solution

The fourth proportional to 126.91, 190.46 and 49.89 is: 74.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.91 : 190.46 = 49.89 : x
  2. Step 2: Convert to fraction form
    126.91/190.46 = 49.89/x
  3. Step 3: Cross multiply
    126.91x = 190.46 × 49.89
  4. Step 4: Simplify right side
    126.91x = 9,502.44
  5. Step 5: Solve for x
    x = 9,502.44/126.91
  6. Step 6: Final answer
    x = 74.88

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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.