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Finding the Fourth Proportional to 819.78, 1,228.95 and 333.24

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Solution

The fourth proportional to 819.78, 1,228.95 and 333.24 is: 499.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.78 : 1,228.95 = 333.24 : x
  2. Step 2: Convert to fraction form
    819.78/1,228.95 = 333.24/x
  3. Step 3: Cross multiply
    819.78x = 1,228.95 × 333.24
  4. Step 4: Simplify right side
    819.78x = 409,535.30
  5. Step 5: Solve for x
    x = 409,535.30/819.78
  6. Step 6: Final answer
    x = 499.57

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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.