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Finding the Fourth Proportional to 548.20, 821.10 and 331.40

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Solution

The fourth proportional to 548.20, 821.10 and 331.40 is: 496.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.20 : 821.10 = 331.40 : x
  2. Step 2: Convert to fraction form
    548.20/821.10 = 331.40/x
  3. Step 3: Cross multiply
    548.20x = 821.10 × 331.40
  4. Step 4: Simplify right side
    548.20x = 272,112.54
  5. Step 5: Solve for x
    x = 272,112.54/548.20
  6. Step 6: Final answer
    x = 496.37

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Double scale
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Similar ratio
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1.5x scale

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.