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Finding the Fourth Proportional to 1,216.11, 1,677.61 and 773.55

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Solution

The fourth proportional to 1,216.11, 1,677.61 and 773.55 is: 1,067.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.11 : 1,677.61 = 773.55 : x
  2. Step 2: Convert to fraction form
    1,216.11/1,677.61 = 773.55/x
  3. Step 3: Cross multiply
    1,216.11x = 1,677.61 × 773.55
  4. Step 4: Simplify right side
    1,216.11x = 1,297,716.18
  5. Step 5: Solve for x
    x = 1,297,716.18/1,216.11
  6. Step 6: Final answer
    x = 1,067.10

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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.