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Finding the Fourth Proportional to 547.55, 821.47 and 239.47

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Solution

The fourth proportional to 547.55, 821.47 and 239.47 is: 359.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.55 : 821.47 = 239.47 : x
  2. Step 2: Convert to fraction form
    547.55/821.47 = 239.47/x
  3. Step 3: Cross multiply
    547.55x = 821.47 × 239.47
  4. Step 4: Simplify right side
    547.55x = 196,717.42
  5. Step 5: Solve for x
    x = 196,717.42/547.55
  6. Step 6: Final answer
    x = 359.27

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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.