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Finding the Fourth Proportional to 779.88, 1,163.82 and 696.75

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Solution

The fourth proportional to 779.88, 1,163.82 and 696.75 is: 1,039.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.88 : 1,163.82 = 696.75 : x
  2. Step 2: Convert to fraction form
    779.88/1,163.82 = 696.75/x
  3. Step 3: Cross multiply
    779.88x = 1,163.82 × 696.75
  4. Step 4: Simplify right side
    779.88x = 810,891.59
  5. Step 5: Solve for x
    x = 810,891.59/779.88
  6. Step 6: Final answer
    x = 1,039.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.