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Finding the Fourth Proportional to 354.27, 489.36 and 243.56

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Solution

The fourth proportional to 354.27, 489.36 and 243.56 is: 336.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.27 : 489.36 = 243.56 : x
  2. Step 2: Convert to fraction form
    354.27/489.36 = 243.56/x
  3. Step 3: Cross multiply
    354.27x = 489.36 × 243.56
  4. Step 4: Simplify right side
    354.27x = 119,185.47
  5. Step 5: Solve for x
    x = 119,185.47/354.27
  6. Step 6: Final answer
    x = 336.43

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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.