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Finding the Third Proportional to 642.63 and 1,382.75

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Solution

The third proportional to 642.63 and 1,382.75 is: 2,975.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.63 : 1,382.75 = 1,382.75 : x
  2. Step 2: Convert to fraction form
    642.63/1,382.75 = 1,382.75/x
  3. Step 3: Cross multiply
    642.63x = 1,382.75 × 1,382.75
  4. Step 4: Simplify right side
    642.63x = 1,911,997.56
  5. Step 5: Solve for x
    x = 1,911,997.56/642.63
  6. Step 6: Final answer
    x = 2,975.29

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.