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Finding the Fourth Proportional to 819.96, 1,229.13 and 408.48

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Solution

The fourth proportional to 819.96, 1,229.13 and 408.48 is: 612.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.96 : 1,229.13 = 408.48 : x
  2. Step 2: Convert to fraction form
    819.96/1,229.13 = 408.48/x
  3. Step 3: Cross multiply
    819.96x = 1,229.13 × 408.48
  4. Step 4: Simplify right side
    819.96x = 502,075.02
  5. Step 5: Solve for x
    x = 502,075.02/819.96
  6. Step 6: Final answer
    x = 612.32

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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.