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Finding the Third Proportional to 386.81 and 850.69

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Solution

The third proportional to 386.81 and 850.69 is: 1,870.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.81 : 850.69 = 850.69 : x
  2. Step 2: Convert to fraction form
    386.81/850.69 = 850.69/x
  3. Step 3: Cross multiply
    386.81x = 850.69 × 850.69
  4. Step 4: Simplify right side
    386.81x = 723,669.22
  5. Step 5: Solve for x
    x = 723,669.22/386.81
  6. Step 6: Final answer
    x = 1,870.85

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.