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Finding the Fourth Proportional to 548.14, 821.40 and 239.71

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Solution

The fourth proportional to 548.14, 821.40 and 239.71 is: 359.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.14 : 821.40 = 239.71 : x
  2. Step 2: Convert to fraction form
    548.14/821.40 = 239.71/x
  3. Step 3: Cross multiply
    548.14x = 821.40 × 239.71
  4. Step 4: Simplify right side
    548.14x = 196,897.79
  5. Step 5: Solve for x
    x = 196,897.79/548.14
  6. Step 6: Final answer
    x = 359.21

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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.