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Finding the Third Proportional to 861 and 1,317.75

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Solution

The third proportional to 861 and 1,317.75 is: 2,016.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    861 : 1,317.75 = 1,317.75 : x
  2. Step 2: Convert to fraction form
    861/1,317.75 = 1,317.75/x
  3. Step 3: Cross multiply
    861x = 1,317.75 × 1,317.75
  4. Step 4: Simplify right side
    861x = 1,736,465.06
  5. Step 5: Solve for x
    x = 1,736,465.06/861
  6. Step 6: Final answer
    x = 2,016.80

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.