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Finding the Fourth Proportional to 819.04, 1,231.08 and 712.12

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Solution

The fourth proportional to 819.04, 1,231.08 and 712.12 is: 1,070.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.04 : 1,231.08 = 712.12 : x
  2. Step 2: Convert to fraction form
    819.04/1,231.08 = 712.12/x
  3. Step 3: Cross multiply
    819.04x = 1,231.08 × 712.12
  4. Step 4: Simplify right side
    819.04x = 876,676.69
  5. Step 5: Solve for x
    x = 876,676.69/819.04
  6. Step 6: Final answer
    x = 1,070.37

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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.