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Finding the Third Proportional to 1,815 and 3,918

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Solution

The third proportional to 1,815 and 3,918 is: 8,457.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815 : 3,918 = 3,918 : x
  2. Step 2: Convert to fraction form
    1,815/3,918 = 3,918/x
  3. Step 3: Cross multiply
    1,815x = 3,918 × 3,918
  4. Step 4: Simplify right side
    1,815x = 15,350,724
  5. Step 5: Solve for x
    x = 15,350,724/1,815
  6. Step 6: Final answer
    x = 8,457.70

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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.