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Finding the Fourth Proportional to 874.31, 1,205.82 and 579.60

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Solution

The fourth proportional to 874.31, 1,205.82 and 579.60 is: 799.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.31 : 1,205.82 = 579.60 : x
  2. Step 2: Convert to fraction form
    874.31/1,205.82 = 579.60/x
  3. Step 3: Cross multiply
    874.31x = 1,205.82 × 579.60
  4. Step 4: Simplify right side
    874.31x = 698,893.27
  5. Step 5: Solve for x
    x = 698,893.27/874.31
  6. Step 6: Final answer
    x = 799.37

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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.