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Finding the Fourth Proportional to 548.82, 756.90 and 489.09

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Solution

The fourth proportional to 548.82, 756.90 and 489.09 is: 674.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.82 : 756.90 = 489.09 : x
  2. Step 2: Convert to fraction form
    548.82/756.90 = 489.09/x
  3. Step 3: Cross multiply
    548.82x = 756.90 × 489.09
  4. Step 4: Simplify right side
    548.82x = 370,188.44
  5. Step 5: Solve for x
    x = 370,188.44/548.82
  6. Step 6: Final answer
    x = 674.52

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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.