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Finding the Third Proportional to 858 and 1,815

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Solution

The third proportional to 858 and 1,815 is: 3,839.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    858 : 1,815 = 1,815 : x
  2. Step 2: Convert to fraction form
    858/1,815 = 1,815/x
  3. Step 3: Cross multiply
    858x = 1,815 × 1,815
  4. Step 4: Simplify right side
    858x = 3,294,225
  5. Step 5: Solve for x
    x = 3,294,225/858
  6. Step 6: Final answer
    x = 3,839.42

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.