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Finding the Fourth Proportional to 717.68, 990.54 and 481.56

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Solution

The fourth proportional to 717.68, 990.54 and 481.56 is: 664.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.68 : 990.54 = 481.56 : x
  2. Step 2: Convert to fraction form
    717.68/990.54 = 481.56/x
  3. Step 3: Cross multiply
    717.68x = 990.54 × 481.56
  4. Step 4: Simplify right side
    717.68x = 477,004.44
  5. Step 5: Solve for x
    x = 477,004.44/717.68
  6. Step 6: Final answer
    x = 664.65

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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.