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Finding the Fourth Proportional to 806.64, 1,115.22 and 772.20

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Solution

The fourth proportional to 806.64, 1,115.22 and 772.20 is: 1,067.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.64 : 1,115.22 = 772.20 : x
  2. Step 2: Convert to fraction form
    806.64/1,115.22 = 772.20/x
  3. Step 3: Cross multiply
    806.64x = 1,115.22 × 772.20
  4. Step 4: Simplify right side
    806.64x = 861,172.88
  5. Step 5: Solve for x
    x = 861,172.88/806.64
  6. Step 6: Final answer
    x = 1,067.60

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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.