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Finding the Fourth Proportional to 638.18, 956.68 and 227.22

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Solution

The fourth proportional to 638.18, 956.68 and 227.22 is: 340.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.18 : 956.68 = 227.22 : x
  2. Step 2: Convert to fraction form
    638.18/956.68 = 227.22/x
  3. Step 3: Cross multiply
    638.18x = 956.68 × 227.22
  4. Step 4: Simplify right side
    638.18x = 217,374.25
  5. Step 5: Solve for x
    x = 217,374.25/638.18
  6. Step 6: Final answer
    x = 340.62

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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.