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Finding the Fourth Proportional to 548.42, 821.55 and 385.46

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Solution

The fourth proportional to 548.42, 821.55 and 385.46 is: 577.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.42 : 821.55 = 385.46 : x
  2. Step 2: Convert to fraction form
    548.42/821.55 = 385.46/x
  3. Step 3: Cross multiply
    548.42x = 821.55 × 385.46
  4. Step 4: Simplify right side
    548.42x = 316,674.66
  5. Step 5: Solve for x
    x = 316,674.66/548.42
  6. Step 6: Final answer
    x = 577.43

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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.