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Finding the Third Proportional to 817 and 1,780

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Solution

The third proportional to 817 and 1,780 is: 3,878.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    817 : 1,780 = 1,780 : x
  2. Step 2: Convert to fraction form
    817/1,780 = 1,780/x
  3. Step 3: Cross multiply
    817x = 1,780 × 1,780
  4. Step 4: Simplify right side
    817x = 3,168,400
  5. Step 5: Solve for x
    x = 3,168,400/817
  6. Step 6: Final answer
    x = 3,878.09

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.