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Finding the Fourth Proportional to 355.72, 489.74 and 281.64

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Solution

The fourth proportional to 355.72, 489.74 and 281.64 is: 387.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.72 : 489.74 = 281.64 : x
  2. Step 2: Convert to fraction form
    355.72/489.74 = 281.64/x
  3. Step 3: Cross multiply
    355.72x = 489.74 × 281.64
  4. Step 4: Simplify right side
    355.72x = 137,930.37
  5. Step 5: Solve for x
    x = 137,930.37/355.72
  6. Step 6: Final answer
    x = 387.75

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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.