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Finding the Third Proportional to 813 and 2,085

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Solution

The third proportional to 813 and 2,085 is: 5,347.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    813 : 2,085 = 2,085 : x
  2. Step 2: Convert to fraction form
    813/2,085 = 2,085/x
  3. Step 3: Cross multiply
    813x = 2,085 × 2,085
  4. Step 4: Simplify right side
    813x = 4,347,225
  5. Step 5: Solve for x
    x = 4,347,225/813
  6. Step 6: Final answer
    x = 5,347.14

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Why These Related Problems?

These problems maintain the same ratio (2.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.