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Finding the Fourth Proportional to 548.56, 755.84 and 489.68

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Solution

The fourth proportional to 548.56, 755.84 and 489.68 is: 674.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.56 : 755.84 = 489.68 : x
  2. Step 2: Convert to fraction form
    548.56/755.84 = 489.68/x
  3. Step 3: Cross multiply
    548.56x = 755.84 × 489.68
  4. Step 4: Simplify right side
    548.56x = 370,119.73
  5. Step 5: Solve for x
    x = 370,119.73/548.56
  6. Step 6: Final answer
    x = 674.71

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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.