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Finding the Third Proportional to 863 and 1,780

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Solution

The third proportional to 863 and 1,780 is: 3,671.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    863 : 1,780 = 1,780 : x
  2. Step 2: Convert to fraction form
    863/1,780 = 1,780/x
  3. Step 3: Cross multiply
    863x = 1,780 × 1,780
  4. Step 4: Simplify right side
    863x = 3,168,400
  5. Step 5: Solve for x
    x = 3,168,400/863
  6. Step 6: Final answer
    x = 3,671.38

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.