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Finding the Third Proportional to 813 and 1,908

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Solution

The third proportional to 813 and 1,908 is: 4,477.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    813 : 1,908 = 1,908 : x
  2. Step 2: Convert to fraction form
    813/1,908 = 1,908/x
  3. Step 3: Cross multiply
    813x = 1,908 × 1,908
  4. Step 4: Simplify right side
    813x = 3,640,464
  5. Step 5: Solve for x
    x = 3,640,464/813
  6. Step 6: Final answer
    x = 4,477.82

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Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.