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Finding the Third Proportional to 642.56 and 1,376.19

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Solution

The third proportional to 642.56 and 1,376.19 is: 2,947.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.56 : 1,376.19 = 1,376.19 : x
  2. Step 2: Convert to fraction form
    642.56/1,376.19 = 1,376.19/x
  3. Step 3: Cross multiply
    642.56x = 1,376.19 × 1,376.19
  4. Step 4: Simplify right side
    642.56x = 1,893,892.04
  5. Step 5: Solve for x
    x = 1,893,892.04/642.56
  6. Step 6: Final answer
    x = 2,947.41

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.