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Finding the Fourth Proportional to 547.90, 821.78 and 239.69

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Solution

The fourth proportional to 547.90, 821.78 and 239.69 is: 359.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.90 : 821.78 = 239.69 : x
  2. Step 2: Convert to fraction form
    547.90/821.78 = 239.69/x
  3. Step 3: Cross multiply
    547.90x = 821.78 × 239.69
  4. Step 4: Simplify right side
    547.90x = 196,974.20
  5. Step 5: Solve for x
    x = 196,974.20/547.90
  6. Step 6: Final answer
    x = 359.51

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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.