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Finding the Fourth Proportional to 355.06, 489.70 and 281.26

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Solution

The fourth proportional to 355.06, 489.70 and 281.26 is: 387.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.06 : 489.70 = 281.26 : x
  2. Step 2: Convert to fraction form
    355.06/489.70 = 281.26/x
  3. Step 3: Cross multiply
    355.06x = 489.70 × 281.26
  4. Step 4: Simplify right side
    355.06x = 137,733.02
  5. Step 5: Solve for x
    x = 137,733.02/355.06
  6. Step 6: Final answer
    x = 387.91

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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.