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Finding the Fourth Proportional to 2,668.19, 4,002.18 and 819.21

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Solution

The fourth proportional to 2,668.19, 4,002.18 and 819.21 is: 1,228.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,668.19 : 4,002.18 = 819.21 : x
  2. Step 2: Convert to fraction form
    2,668.19/4,002.18 = 819.21/x
  3. Step 3: Cross multiply
    2,668.19x = 4,002.18 × 819.21
  4. Step 4: Simplify right side
    2,668.19x = 3,278,625.88
  5. Step 5: Solve for x
    x = 3,278,625.88/2,668.19
  6. Step 6: Final answer
    x = 1,228.78

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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.