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Finding the Fourth Proportional to 226.06, 311.98 and 138.72

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Solution

The fourth proportional to 226.06, 311.98 and 138.72 is: 191.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.06 : 311.98 = 138.72 : x
  2. Step 2: Convert to fraction form
    226.06/311.98 = 138.72/x
  3. Step 3: Cross multiply
    226.06x = 311.98 × 138.72
  4. Step 4: Simplify right side
    226.06x = 43,277.87
  5. Step 5: Solve for x
    x = 43,277.87/226.06
  6. Step 6: Final answer
    x = 191.44

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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.