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Finding the Fourth Proportional to 225.67, 311.28 and 138.25

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Solution

The fourth proportional to 225.67, 311.28 and 138.25 is: 190.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.67 : 311.28 = 138.25 : x
  2. Step 2: Convert to fraction form
    225.67/311.28 = 138.25/x
  3. Step 3: Cross multiply
    225.67x = 311.28 × 138.25
  4. Step 4: Simplify right side
    225.67x = 43,034.46
  5. Step 5: Solve for x
    x = 43,034.46/225.67
  6. Step 6: Final answer
    x = 190.70

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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.