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Finding the Fourth Proportional to 226.14, 312.09 and 138.79

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Solution

The fourth proportional to 226.14, 312.09 and 138.79 is: 191.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.14 : 312.09 = 138.79 : x
  2. Step 2: Convert to fraction form
    226.14/312.09 = 138.79/x
  3. Step 3: Cross multiply
    226.14x = 312.09 × 138.79
  4. Step 4: Simplify right side
    226.14x = 43,314.97
  5. Step 5: Solve for x
    x = 43,314.97/226.14
  6. Step 6: Final answer
    x = 191.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.