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Finding the Fourth Proportional to 819.25, 1,229.21 and 357.42

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Solution

The fourth proportional to 819.25, 1,229.21 and 357.42 is: 536.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.25 : 1,229.21 = 357.42 : x
  2. Step 2: Convert to fraction form
    819.25/1,229.21 = 357.42/x
  3. Step 3: Cross multiply
    819.25x = 1,229.21 × 357.42
  4. Step 4: Simplify right side
    819.25x = 439,344.24
  5. Step 5: Solve for x
    x = 439,344.24/819.25
  6. Step 6: Final answer
    x = 536.28

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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.