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Finding the Fourth Proportional to 548.25, 821.69 and 391.84

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Solution

The fourth proportional to 548.25, 821.69 and 391.84 is: 587.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.25 : 821.69 = 391.84 : x
  2. Step 2: Convert to fraction form
    548.25/821.69 = 391.84/x
  3. Step 3: Cross multiply
    548.25x = 821.69 × 391.84
  4. Step 4: Simplify right side
    548.25x = 321,970.67
  5. Step 5: Solve for x
    x = 321,970.67/548.25
  6. Step 6: Final answer
    x = 587.27

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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.