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Finding the Fourth Proportional to 819.69, 1,131.06 and 487.99

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Solution

The fourth proportional to 819.69, 1,131.06 and 487.99 is: 673.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.69 : 1,131.06 = 487.99 : x
  2. Step 2: Convert to fraction form
    819.69/1,131.06 = 487.99/x
  3. Step 3: Cross multiply
    819.69x = 1,131.06 × 487.99
  4. Step 4: Simplify right side
    819.69x = 551,945.97
  5. Step 5: Solve for x
    x = 551,945.97/819.69
  6. Step 6: Final answer
    x = 673.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.