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Finding the Fourth Proportional to 547.88, 821.41 and 218.71

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Solution

The fourth proportional to 547.88, 821.41 and 218.71 is: 327.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.88 : 821.41 = 218.71 : x
  2. Step 2: Convert to fraction form
    547.88/821.41 = 218.71/x
  3. Step 3: Cross multiply
    547.88x = 821.41 × 218.71
  4. Step 4: Simplify right side
    547.88x = 179,653.18
  5. Step 5: Solve for x
    x = 179,653.18/547.88
  6. Step 6: Final answer
    x = 327.91

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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.