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Finding the Fourth Proportional to 717.75, 990.34 and 422.91

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Solution

The fourth proportional to 717.75, 990.34 and 422.91 is: 583.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.75 : 990.34 = 422.91 : x
  2. Step 2: Convert to fraction form
    717.75/990.34 = 422.91/x
  3. Step 3: Cross multiply
    717.75x = 990.34 × 422.91
  4. Step 4: Simplify right side
    717.75x = 418,824.69
  5. Step 5: Solve for x
    x = 418,824.69/717.75
  6. Step 6: Final answer
    x = 583.52

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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.