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Finding the Fourth Proportional to 354.59, 489.18 and 243.87

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Solution

The fourth proportional to 354.59, 489.18 and 243.87 is: 336.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.59 : 489.18 = 243.87 : x
  2. Step 2: Convert to fraction form
    354.59/489.18 = 243.87/x
  3. Step 3: Cross multiply
    354.59x = 489.18 × 243.87
  4. Step 4: Simplify right side
    354.59x = 119,296.33
  5. Step 5: Solve for x
    x = 119,296.33/354.59
  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.