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Finding the Third Proportional to 389 and 856

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Solution

The third proportional to 389 and 856 is: 1,883.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    389 : 856 = 856 : x
  2. Step 2: Convert to fraction form
    389/856 = 856/x
  3. Step 3: Cross multiply
    389x = 856 × 856
  4. Step 4: Simplify right side
    389x = 732,736
  5. Step 5: Solve for x
    x = 732,736/389
  6. Step 6: Final answer
    x = 1,883.64

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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.