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Finding the Fourth Proportional to 354.28, 489.30 and 223.39

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Solution

The fourth proportional to 354.28, 489.30 and 223.39 is: 308.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.28 : 489.30 = 223.39 : x
  2. Step 2: Convert to fraction form
    354.28/489.30 = 223.39/x
  3. Step 3: Cross multiply
    354.28x = 489.30 × 223.39
  4. Step 4: Simplify right side
    354.28x = 109,304.73
  5. Step 5: Solve for x
    x = 109,304.73/354.28
  6. Step 6: Final answer
    x = 308.53

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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.