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Finding the Fourth Proportional to 819.36, 1,229.40 and 357.48

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Solution

The fourth proportional to 819.36, 1,229.40 and 357.48 is: 536.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.36 : 1,229.40 = 357.48 : x
  2. Step 2: Convert to fraction form
    819.36/1,229.40 = 357.48/x
  3. Step 3: Cross multiply
    819.36x = 1,229.40 × 357.48
  4. Step 4: Simplify right side
    819.36x = 439,485.91
  5. Step 5: Solve for x
    x = 439,485.91/819.36
  6. Step 6: Final answer
    x = 536.38

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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.