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Finding the Third Proportional to 392.98 and 837.21

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Solution

The third proportional to 392.98 and 837.21 is: 1,783.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.98 : 837.21 = 837.21 : x
  2. Step 2: Convert to fraction form
    392.98/837.21 = 837.21/x
  3. Step 3: Cross multiply
    392.98x = 837.21 × 837.21
  4. Step 4: Simplify right side
    392.98x = 700,922.15
  5. Step 5: Solve for x
    x = 700,922.15/392.98
  6. Step 6: Final answer
    x = 1,783.62

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.