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Finding the Third Proportional to 319.75 and 671.75

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Solution

The third proportional to 319.75 and 671.75 is: 1,411.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.75 : 671.75 = 671.75 : x
  2. Step 2: Convert to fraction form
    319.75/671.75 = 671.75/x
  3. Step 3: Cross multiply
    319.75x = 671.75 × 671.75
  4. Step 4: Simplify right side
    319.75x = 451,248.06
  5. Step 5: Solve for x
    x = 451,248.06/319.75
  6. Step 6: Final answer
    x = 1,411.25

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.