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Finding the Fourth Proportional to 819.94, 1,230.30 and 409.11

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Solution

The fourth proportional to 819.94, 1,230.30 and 409.11 is: 613.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.94 : 1,230.30 = 409.11 : x
  2. Step 2: Convert to fraction form
    819.94/1,230.30 = 409.11/x
  3. Step 3: Cross multiply
    819.94x = 1,230.30 × 409.11
  4. Step 4: Simplify right side
    819.94x = 503,328.03
  5. Step 5: Solve for x
    x = 503,328.03/819.94
  6. Step 6: Final answer
    x = 613.86

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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.