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Finding the Third Proportional to 2,118 and 2,985

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Solution

The third proportional to 2,118 and 2,985 is: 4,206.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118 : 2,985 = 2,985 : x
  2. Step 2: Convert to fraction form
    2,118/2,985 = 2,985/x
  3. Step 3: Cross multiply
    2,118x = 2,985 × 2,985
  4. Step 4: Simplify right side
    2,118x = 8,910,225
  5. Step 5: Solve for x
    x = 8,910,225/2,118
  6. Step 6: Final answer
    x = 4,206.91

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.