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Finding the Third Proportional to 861 and 1,858.50

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Solution

The third proportional to 861 and 1,858.50 is: 4,011.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    861 : 1,858.50 = 1,858.50 : x
  2. Step 2: Convert to fraction form
    861/1,858.50 = 1,858.50/x
  3. Step 3: Cross multiply
    861x = 1,858.50 × 1,858.50
  4. Step 4: Simplify right side
    861x = 3,454,022.25
  5. Step 5: Solve for x
    x = 3,454,022.25/861
  6. Step 6: Final answer
    x = 4,011.64

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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.