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Finding the Fourth Proportional to 355.48, 489.50 and 281.56

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Solution

The fourth proportional to 355.48, 489.50 and 281.56 is: 387.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.48 : 489.50 = 281.56 : x
  2. Step 2: Convert to fraction form
    355.48/489.50 = 281.56/x
  3. Step 3: Cross multiply
    355.48x = 489.50 × 281.56
  4. Step 4: Simplify right side
    355.48x = 137,823.62
  5. Step 5: Solve for x
    x = 137,823.62/355.48
  6. Step 6: Final answer
    x = 387.71

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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.