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Finding the Fourth Proportional to 225.71, 311.39 and 163.40

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Solution

The fourth proportional to 225.71, 311.39 and 163.40 is: 225.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.71 : 311.39 = 163.40 : x
  2. Step 2: Convert to fraction form
    225.71/311.39 = 163.40/x
  3. Step 3: Cross multiply
    225.71x = 311.39 × 163.40
  4. Step 4: Simplify right side
    225.71x = 50,881.09
  5. Step 5: Solve for x
    x = 50,881.09/225.71
  6. Step 6: Final answer
    x = 225.42

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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.