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Finding the Fourth Proportional to 717.17, 989.62 and 422.39

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Solution

The fourth proportional to 717.17, 989.62 and 422.39 is: 582.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.17 : 989.62 = 422.39 : x
  2. Step 2: Convert to fraction form
    717.17/989.62 = 422.39/x
  3. Step 3: Cross multiply
    717.17x = 989.62 × 422.39
  4. Step 4: Simplify right side
    717.17x = 418,007.01
  5. Step 5: Solve for x
    x = 418,007.01/717.17
  6. Step 6: Final answer
    x = 582.86

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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.