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Finding the Third Proportional to 821.63 and 1,780

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Solution

The third proportional to 821.63 and 1,780 is: 3,856.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.63 : 1,780 = 1,780 : x
  2. Step 2: Convert to fraction form
    821.63/1,780 = 1,780/x
  3. Step 3: Cross multiply
    821.63x = 1,780 × 1,780
  4. Step 4: Simplify right side
    821.63x = 3,168,400
  5. Step 5: Solve for x
    x = 3,168,400/821.63
  6. Step 6: Final answer
    x = 3,856.26

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.