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Finding the Fourth Proportional to 548.18, 821.35 and 385.52

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Solution

The fourth proportional to 548.18, 821.35 and 385.52 is: 577.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.18 : 821.35 = 385.52 : x
  2. Step 2: Convert to fraction form
    548.18/821.35 = 385.52/x
  3. Step 3: Cross multiply
    548.18x = 821.35 × 385.52
  4. Step 4: Simplify right side
    548.18x = 316,646.31
  5. Step 5: Solve for x
    x = 316,646.31/548.18
  6. Step 6: Final answer
    x = 577.64

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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.