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Finding the Fourth Proportional to 548.13, 821.79 and 239.82

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Solution

The fourth proportional to 548.13, 821.79 and 239.82 is: 359.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.13 : 821.79 = 239.82 : x
  2. Step 2: Convert to fraction form
    548.13/821.79 = 239.82/x
  3. Step 3: Cross multiply
    548.13x = 821.79 × 239.82
  4. Step 4: Simplify right side
    548.13x = 197,081.68
  5. Step 5: Solve for x
    x = 197,081.68/548.13
  6. Step 6: Final answer
    x = 359.55

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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.