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Finding the Fourth Proportional to 819.78, 1,131.30 and 446.75

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Solution

The fourth proportional to 819.78, 1,131.30 and 446.75 is: 616.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.78 : 1,131.30 = 446.75 : x
  2. Step 2: Convert to fraction form
    819.78/1,131.30 = 446.75/x
  3. Step 3: Cross multiply
    819.78x = 1,131.30 × 446.75
  4. Step 4: Simplify right side
    819.78x = 505,408.28
  5. Step 5: Solve for x
    x = 505,408.28/819.78
  6. Step 6: Final answer
    x = 616.52

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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.