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Finding the Fourth Proportional to 717.20, 989.93 and 422.56

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Solution

The fourth proportional to 717.20, 989.93 and 422.56 is: 583.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.20 : 989.93 = 422.56 : x
  2. Step 2: Convert to fraction form
    717.20/989.93 = 422.56/x
  3. Step 3: Cross multiply
    717.20x = 989.93 × 422.56
  4. Step 4: Simplify right side
    717.20x = 418,304.82
  5. Step 5: Solve for x
    x = 418,304.82/717.20
  6. Step 6: Final answer
    x = 583.25

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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.