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Finding the Third Proportional to 319 and 685.75

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Solution

The third proportional to 319 and 685.75 is: 1,474.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    319 : 685.75 = 685.75 : x
  2. Step 2: Convert to fraction form
    319/685.75 = 685.75/x
  3. Step 3: Cross multiply
    319x = 685.75 × 685.75
  4. Step 4: Simplify right side
    319x = 470,253.06
  5. Step 5: Solve for x
    x = 470,253.06/319
  6. Step 6: Final answer
    x = 1,474.15

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.