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Finding the Fourth Proportional to 819.80, 1,226.82 and 511.64

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Solution

The fourth proportional to 819.80, 1,226.82 and 511.64 is: 765.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.80 : 1,226.82 = 511.64 : x
  2. Step 2: Convert to fraction form
    819.80/1,226.82 = 511.64/x
  3. Step 3: Cross multiply
    819.80x = 1,226.82 × 511.64
  4. Step 4: Simplify right side
    819.80x = 627,690.18
  5. Step 5: Solve for x
    x = 627,690.18/819.80
  6. Step 6: Final answer
    x = 765.66

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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.