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Finding the Fourth Proportional to 879.63, 1,213.92 and 481.31

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Solution

The fourth proportional to 879.63, 1,213.92 and 481.31 is: 664.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.63 : 1,213.92 = 481.31 : x
  2. Step 2: Convert to fraction form
    879.63/1,213.92 = 481.31/x
  3. Step 3: Cross multiply
    879.63x = 1,213.92 × 481.31
  4. Step 4: Simplify right side
    879.63x = 584,270.32
  5. Step 5: Solve for x
    x = 584,270.32/879.63
  6. Step 6: Final answer
    x = 664.23

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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.