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Finding the Fourth Proportional to 547.72, 821.77 and 239.41

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Solution

The fourth proportional to 547.72, 821.77 and 239.41 is: 359.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.72 : 821.77 = 239.41 : x
  2. Step 2: Convert to fraction form
    547.72/821.77 = 239.41/x
  3. Step 3: Cross multiply
    547.72x = 821.77 × 239.41
  4. Step 4: Simplify right side
    547.72x = 196,739.96
  5. Step 5: Solve for x
    x = 196,739.96/547.72
  6. Step 6: Final answer
    x = 359.20

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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.