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Finding the Fourth Proportional to 548.24, 821.43 and 255.42

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Solution

The fourth proportional to 548.24, 821.43 and 255.42 is: 382.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.24 : 821.43 = 255.42 : x
  2. Step 2: Convert to fraction form
    548.24/821.43 = 255.42/x
  3. Step 3: Cross multiply
    548.24x = 821.43 × 255.42
  4. Step 4: Simplify right side
    548.24x = 209,809.65
  5. Step 5: Solve for x
    x = 209,809.65/548.24
  6. Step 6: Final answer
    x = 382.70

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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.