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Finding the Third Proportional to 386.75 and 805.75

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Solution

The third proportional to 386.75 and 805.75 is: 1,678.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.75 : 805.75 = 805.75 : x
  2. Step 2: Convert to fraction form
    386.75/805.75 = 805.75/x
  3. Step 3: Cross multiply
    386.75x = 805.75 × 805.75
  4. Step 4: Simplify right side
    386.75x = 649,233.06
  5. Step 5: Solve for x
    x = 649,233.06/386.75
  6. Step 6: Final answer
    x = 1,678.69

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.