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Finding the Fourth Proportional to 548.11, 821.50 and 255.21

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Solution

The fourth proportional to 548.11, 821.50 and 255.21 is: 382.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.11 : 821.50 = 255.21 : x
  2. Step 2: Convert to fraction form
    548.11/821.50 = 255.21/x
  3. Step 3: Cross multiply
    548.11x = 821.50 × 255.21
  4. Step 4: Simplify right side
    548.11x = 209,655.02
  5. Step 5: Solve for x
    x = 209,655.02/548.11
  6. Step 6: Final answer
    x = 382.51

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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.