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Finding the Fourth Proportional to 819.96, 1,228.92 and 351.24

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Solution

The fourth proportional to 819.96, 1,228.92 and 351.24 is: 526.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.96 : 1,228.92 = 351.24 : x
  2. Step 2: Convert to fraction form
    819.96/1,228.92 = 351.24/x
  3. Step 3: Cross multiply
    819.96x = 1,228.92 × 351.24
  4. Step 4: Simplify right side
    819.96x = 431,645.86
  5. Step 5: Solve for x
    x = 431,645.86/819.96
  6. Step 6: Final answer
    x = 526.42

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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.