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Finding the Fourth Proportional to 717.19, 989.72 and 422.62

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Solution

The fourth proportional to 717.19, 989.72 and 422.62 is: 583.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.19 : 989.72 = 422.62 : x
  2. Step 2: Convert to fraction form
    717.19/989.72 = 422.62/x
  3. Step 3: Cross multiply
    717.19x = 989.72 × 422.62
  4. Step 4: Simplify right side
    717.19x = 418,272.46
  5. Step 5: Solve for x
    x = 418,272.46/717.19
  6. Step 6: Final answer
    x = 583.21

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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.