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Finding the Third Proportional to 823 and 1,985

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Solution

The third proportional to 823 and 1,985 is: 4,787.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    823 : 1,985 = 1,985 : x
  2. Step 2: Convert to fraction form
    823/1,985 = 1,985/x
  3. Step 3: Cross multiply
    823x = 1,985 × 1,985
  4. Step 4: Simplify right side
    823x = 3,940,225
  5. Step 5: Solve for x
    x = 3,940,225/823
  6. Step 6: Final answer
    x = 4,787.64

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Why These Related Problems?

These problems maintain the same ratio (2.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.