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Finding the Fourth Proportional to 547.20, 819.60 and 330.40

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Solution

The fourth proportional to 547.20, 819.60 and 330.40 is: 494.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.20 : 819.60 = 330.40 : x
  2. Step 2: Convert to fraction form
    547.20/819.60 = 330.40/x
  3. Step 3: Cross multiply
    547.20x = 819.60 × 330.40
  4. Step 4: Simplify right side
    547.20x = 270,795.84
  5. Step 5: Solve for x
    x = 270,795.84/547.20
  6. Step 6: Final answer
    x = 494.88

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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.