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Finding the Fourth Proportional to 881.26, 1,321.04 and 490.90

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Solution

The fourth proportional to 881.26, 1,321.04 and 490.90 is: 735.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.26 : 1,321.04 = 490.90 : x
  2. Step 2: Convert to fraction form
    881.26/1,321.04 = 490.90/x
  3. Step 3: Cross multiply
    881.26x = 1,321.04 × 490.90
  4. Step 4: Simplify right side
    881.26x = 648,498.54
  5. Step 5: Solve for x
    x = 648,498.54/881.26
  6. Step 6: Final answer
    x = 735.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.