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Finding the Fourth Proportional to 548.25, 821.47 and 385.60

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Solution

The fourth proportional to 548.25, 821.47 and 385.60 is: 577.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.25 : 821.47 = 385.60 : x
  2. Step 2: Convert to fraction form
    548.25/821.47 = 385.60/x
  3. Step 3: Cross multiply
    548.25x = 821.47 × 385.60
  4. Step 4: Simplify right side
    548.25x = 316,754.24
  5. Step 5: Solve for x
    x = 316,754.24/548.25
  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.