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Finding the Third Proportional to 1,389 and 1,863

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Solution

The third proportional to 1,389 and 1,863 is: 2,498.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389 : 1,863 = 1,863 : x
  2. Step 2: Convert to fraction form
    1,389/1,863 = 1,863/x
  3. Step 3: Cross multiply
    1,389x = 1,863 × 1,863
  4. Step 4: Simplify right side
    1,389x = 3,470,769
  5. Step 5: Solve for x
    x = 3,470,769/1,389
  6. Step 6: Final answer
    x = 2,498.75

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.