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Finding the Fourth Proportional to 717.76, 990.36 and 455.68

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Solution

The fourth proportional to 717.76, 990.36 and 455.68 is: 628.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.76 : 990.36 = 455.68 : x
  2. Step 2: Convert to fraction form
    717.76/990.36 = 455.68/x
  3. Step 3: Cross multiply
    717.76x = 990.36 × 455.68
  4. Step 4: Simplify right side
    717.76x = 451,287.24
  5. Step 5: Solve for x
    x = 451,287.24/717.76
  6. Step 6: Final answer
    x = 628.74

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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.