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Finding the Third Proportional to 642 and 922

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Solution

The third proportional to 642 and 922 is: 1,324.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    642 : 922 = 922 : x
  2. Step 2: Convert to fraction form
    642/922 = 922/x
  3. Step 3: Cross multiply
    642x = 922 × 922
  4. Step 4: Simplify right side
    642x = 850,084
  5. Step 5: Solve for x
    x = 850,084/642
  6. Step 6: Final answer
    x = 1,324.12

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Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.