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Finding the Third Proportional to 783.31 and 1,721.56

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Solution

The third proportional to 783.31 and 1,721.56 is: 3,783.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.31 : 1,721.56 = 1,721.56 : x
  2. Step 2: Convert to fraction form
    783.31/1,721.56 = 1,721.56/x
  3. Step 3: Cross multiply
    783.31x = 1,721.56 × 1,721.56
  4. Step 4: Simplify right side
    783.31x = 2,963,777.44
  5. Step 5: Solve for x
    x = 2,963,777.44/783.31
  6. Step 6: Final answer
    x = 3,783.65

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.