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Finding the Fourth Proportional to 355.26, 489.67 and 281.41

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Solution

The fourth proportional to 355.26, 489.67 and 281.41 is: 387.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.26 : 489.67 = 281.41 : x
  2. Step 2: Convert to fraction form
    355.26/489.67 = 281.41/x
  3. Step 3: Cross multiply
    355.26x = 489.67 × 281.41
  4. Step 4: Simplify right side
    355.26x = 137,798.03
  5. Step 5: Solve for x
    x = 137,798.03/355.26
  6. Step 6: Final answer
    x = 387.88

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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.