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Finding the Third Proportional to 642.94 and 1,371.94

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Solution

The third proportional to 642.94 and 1,371.94 is: 2,927.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.94 : 1,371.94 = 1,371.94 : x
  2. Step 2: Convert to fraction form
    642.94/1,371.94 = 1,371.94/x
  3. Step 3: Cross multiply
    642.94x = 1,371.94 × 1,371.94
  4. Step 4: Simplify right side
    642.94x = 1,882,212.50
  5. Step 5: Solve for x
    x = 1,882,212.50/642.94
  6. Step 6: Final answer
    x = 2,927.52

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.