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Finding the Fourth Proportional to 225.59, 338.28 and 81.30

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Solution

The fourth proportional to 225.59, 338.28 and 81.30 is: 121.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.59 : 338.28 = 81.30 : x
  2. Step 2: Convert to fraction form
    225.59/338.28 = 81.30/x
  3. Step 3: Cross multiply
    225.59x = 338.28 × 81.30
  4. Step 4: Simplify right side
    225.59x = 27,503.13
  5. Step 5: Solve for x
    x = 27,503.13/225.59
  6. Step 6: Final answer
    x = 121.92

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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.