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Finding the Fourth Proportional to 871.78, 1,197.94 and 696.82

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Solution

The fourth proportional to 871.78, 1,197.94 and 696.82 is: 957.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.78 : 1,197.94 = 696.82 : x
  2. Step 2: Convert to fraction form
    871.78/1,197.94 = 696.82/x
  3. Step 3: Cross multiply
    871.78x = 1,197.94 × 696.82
  4. Step 4: Simplify right side
    871.78x = 834,745.07
  5. Step 5: Solve for x
    x = 834,745.07/871.78
  6. Step 6: Final answer
    x = 957.52

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.