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Finding the Third Proportional to 321 and 681.75

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Solution

The third proportional to 321 and 681.75 is: 1,447.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    321 : 681.75 = 681.75 : x
  2. Step 2: Convert to fraction form
    321/681.75 = 681.75/x
  3. Step 3: Cross multiply
    321x = 681.75 × 681.75
  4. Step 4: Simplify right side
    321x = 464,783.06
  5. Step 5: Solve for x
    x = 464,783.06/321
  6. Step 6: Final answer
    x = 1,447.92

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.