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Finding the Third Proportional to 840 and 1,982

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Solution

The third proportional to 840 and 1,982 is: 4,676.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    840 : 1,982 = 1,982 : x
  2. Step 2: Convert to fraction form
    840/1,982 = 1,982/x
  3. Step 3: Cross multiply
    840x = 1,982 × 1,982
  4. Step 4: Simplify right side
    840x = 3,928,324
  5. Step 5: Solve for x
    x = 3,928,324/840
  6. Step 6: Final answer
    x = 4,676.58

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.