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Finding the Fourth Proportional to 548.56, 821.49 and 385.48

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Solution

The fourth proportional to 548.56, 821.49 and 385.48 is: 577.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.56 : 821.49 = 385.48 : x
  2. Step 2: Convert to fraction form
    548.56/821.49 = 385.48/x
  3. Step 3: Cross multiply
    548.56x = 821.49 × 385.48
  4. Step 4: Simplify right side
    548.56x = 316,667.97
  5. Step 5: Solve for x
    x = 316,667.97/548.56
  6. Step 6: Final answer
    x = 577.27

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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.