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Finding the Fourth Proportional to 717.45, 990.27 and 422.81

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Solution

The fourth proportional to 717.45, 990.27 and 422.81 is: 583.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.45 : 990.27 = 422.81 : x
  2. Step 2: Convert to fraction form
    717.45/990.27 = 422.81/x
  3. Step 3: Cross multiply
    717.45x = 990.27 × 422.81
  4. Step 4: Simplify right side
    717.45x = 418,698.53
  5. Step 5: Solve for x
    x = 418,698.53/717.45
  6. Step 6: Final answer
    x = 583.59

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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.