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Finding the Fourth Proportional to 717.53, 990.87 and 481.66

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Solution

The fourth proportional to 717.53, 990.87 and 481.66 is: 665.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.53 : 990.87 = 481.66 : x
  2. Step 2: Convert to fraction form
    717.53/990.87 = 481.66/x
  3. Step 3: Cross multiply
    717.53x = 990.87 × 481.66
  4. Step 4: Simplify right side
    717.53x = 477,258.16
  5. Step 5: Solve for x
    x = 477,258.16/717.53
  6. Step 6: Final answer
    x = 665.14

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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.