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Finding the Fourth Proportional to 874.74, 1,198.58 and 861.78

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Solution

The fourth proportional to 874.74, 1,198.58 and 861.78 is: 1,180.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.74 : 1,198.58 = 861.78 : x
  2. Step 2: Convert to fraction form
    874.74/1,198.58 = 861.78/x
  3. Step 3: Cross multiply
    874.74x = 1,198.58 × 861.78
  4. Step 4: Simplify right side
    874.74x = 1,032,907.96
  5. Step 5: Solve for x
    x = 1,032,907.96/874.74
  6. Step 6: Final answer
    x = 1,180.82

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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.