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Finding the Third Proportional to 312.75 and 681.25

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Solution

The third proportional to 312.75 and 681.25 is: 1,483.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.75 : 681.25 = 681.25 : x
  2. Step 2: Convert to fraction form
    312.75/681.25 = 681.25/x
  3. Step 3: Cross multiply
    312.75x = 681.25 × 681.25
  4. Step 4: Simplify right side
    312.75x = 464,101.56
  5. Step 5: Solve for x
    x = 464,101.56/312.75
  6. Step 6: Final answer
    x = 1,483.94

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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.