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Finding the Fourth Proportional to 819.89, 1,229.85 and 456.99

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Solution

The fourth proportional to 819.89, 1,229.85 and 456.99 is: 685.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.89 : 1,229.85 = 456.99 : x
  2. Step 2: Convert to fraction form
    819.89/1,229.85 = 456.99/x
  3. Step 3: Cross multiply
    819.89x = 1,229.85 × 456.99
  4. Step 4: Simplify right side
    819.89x = 562,021.29
  5. Step 5: Solve for x
    x = 562,021.29/819.89
  6. Step 6: Final answer
    x = 685.48

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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.