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Finding the Third Proportional to 490.88 and 621.94

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Solution

The third proportional to 490.88 and 621.94 is: 787.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.88 : 621.94 = 621.94 : x
  2. Step 2: Convert to fraction form
    490.88/621.94 = 621.94/x
  3. Step 3: Cross multiply
    490.88x = 621.94 × 621.94
  4. Step 4: Simplify right side
    490.88x = 386,806.25
  5. Step 5: Solve for x
    x = 386,806.25/490.88
  6. Step 6: Final answer
    x = 787.99

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.