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Finding the Fourth Proportional to 547.70, 821.85 and 328.39

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Solution

The fourth proportional to 547.70, 821.85 and 328.39 is: 492.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.70 : 821.85 = 328.39 : x
  2. Step 2: Convert to fraction form
    547.70/821.85 = 328.39/x
  3. Step 3: Cross multiply
    547.70x = 821.85 × 328.39
  4. Step 4: Simplify right side
    547.70x = 269,884.04
  5. Step 5: Solve for x
    x = 269,884.04/547.70
  6. Step 6: Final answer
    x = 492.76

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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.