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Finding the Fourth Proportional to 717.85, 990.62 and 423.21

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Solution

The fourth proportional to 717.85, 990.62 and 423.21 is: 584.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.85 : 990.62 = 423.21 : x
  2. Step 2: Convert to fraction form
    717.85/990.62 = 423.21/x
  3. Step 3: Cross multiply
    717.85x = 990.62 × 423.21
  4. Step 4: Simplify right side
    717.85x = 419,240.29
  5. Step 5: Solve for x
    x = 419,240.29/717.85
  6. Step 6: Final answer
    x = 584.02

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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.