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Finding the Fourth Proportional to 548.06, 821.39 and 255.15

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Solution

The fourth proportional to 548.06, 821.39 and 255.15 is: 382.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.06 : 821.39 = 255.15 : x
  2. Step 2: Convert to fraction form
    548.06/821.39 = 255.15/x
  3. Step 3: Cross multiply
    548.06x = 821.39 × 255.15
  4. Step 4: Simplify right side
    548.06x = 209,576.38
  5. Step 5: Solve for x
    x = 209,576.38/548.06
  6. Step 6: Final answer
    x = 382.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.