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Finding the Fourth Proportional to 548.71, 822.15 and 385.59

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Solution

The fourth proportional to 548.71, 822.15 and 385.59 is: 577.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.71 : 822.15 = 385.59 : x
  2. Step 2: Convert to fraction form
    548.71/822.15 = 385.59/x
  3. Step 3: Cross multiply
    548.71x = 822.15 × 385.59
  4. Step 4: Simplify right side
    548.71x = 317,015.90
  5. Step 5: Solve for x
    x = 317,015.90/548.71
  6. Step 6: Final answer
    x = 577.75

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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.