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Finding the Fourth Proportional to 239.28, 358.38 and 225.78

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Solution

The fourth proportional to 239.28, 358.38 and 225.78 is: 338.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.28 : 358.38 = 225.78 : x
  2. Step 2: Convert to fraction form
    239.28/358.38 = 225.78/x
  3. Step 3: Cross multiply
    239.28x = 358.38 × 225.78
  4. Step 4: Simplify right side
    239.28x = 80,915.04
  5. Step 5: Solve for x
    x = 80,915.04/239.28
  6. Step 6: Final answer
    x = 338.16

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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.