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Finding the Third Proportional to 631.97 and 1,378.69

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Solution

The third proportional to 631.97 and 1,378.69 is: 3,007.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.97 : 1,378.69 = 1,378.69 : x
  2. Step 2: Convert to fraction form
    631.97/1,378.69 = 1,378.69/x
  3. Step 3: Cross multiply
    631.97x = 1,378.69 × 1,378.69
  4. Step 4: Simplify right side
    631.97x = 1,900,779.22
  5. Step 5: Solve for x
    x = 1,900,779.22/631.97
  6. Step 6: Final answer
    x = 3,007.71

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.