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Finding the Fourth Proportional to 717.26, 990.23 and 481.55

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Solution

The fourth proportional to 717.26, 990.23 and 481.55 is: 664.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.26 : 990.23 = 481.55 : x
  2. Step 2: Convert to fraction form
    717.26/990.23 = 481.55/x
  3. Step 3: Cross multiply
    717.26x = 990.23 × 481.55
  4. Step 4: Simplify right side
    717.26x = 476,837.90
  5. Step 5: Solve for x
    x = 476,837.90/717.26
  6. Step 6: Final answer
    x = 664.81

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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.