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Finding the Fourth Proportional to 548.22, 821.42 and 385.56

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Solution

The fourth proportional to 548.22, 821.42 and 385.56 is: 577.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.22 : 821.42 = 385.56 : x
  2. Step 2: Convert to fraction form
    548.22/821.42 = 385.56/x
  3. Step 3: Cross multiply
    548.22x = 821.42 × 385.56
  4. Step 4: Simplify right side
    548.22x = 316,710.74
  5. Step 5: Solve for x
    x = 316,710.74/548.22
  6. Step 6: Final answer
    x = 577.70

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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.