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Finding the Third Proportional to 816.75 and 1,917

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Solution

The third proportional to 816.75 and 1,917 is: 4,499.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.75 : 1,917 = 1,917 : x
  2. Step 2: Convert to fraction form
    816.75/1,917 = 1,917/x
  3. Step 3: Cross multiply
    816.75x = 1,917 × 1,917
  4. Step 4: Simplify right side
    816.75x = 3,674,889
  5. Step 5: Solve for x
    x = 3,674,889/816.75
  6. Step 6: Final answer
    x = 4,499.40

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Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.