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Finding the Fourth Proportional to 225.57, 311.31 and 138.30

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Solution

The fourth proportional to 225.57, 311.31 and 138.30 is: 190.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.57 : 311.31 = 138.30 : x
  2. Step 2: Convert to fraction form
    225.57/311.31 = 138.30/x
  3. Step 3: Cross multiply
    225.57x = 311.31 × 138.30
  4. Step 4: Simplify right side
    225.57x = 43,054.17
  5. Step 5: Solve for x
    x = 43,054.17/225.57
  6. Step 6: Final answer
    x = 190.87

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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.