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Finding the Third Proportional to 861 and 1,856

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Solution

The third proportional to 861 and 1,856 is: 4,000.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    861 : 1,856 = 1,856 : x
  2. Step 2: Convert to fraction form
    861/1,856 = 1,856/x
  3. Step 3: Cross multiply
    861x = 1,856 × 1,856
  4. Step 4: Simplify right side
    861x = 3,444,736
  5. Step 5: Solve for x
    x = 3,444,736/861
  6. Step 6: Final answer
    x = 4,000.85

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.