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Finding the Third Proportional to 1,389 and 2,642

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Solution

The third proportional to 1,389 and 2,642 is: 5,025.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389 : 2,642 = 2,642 : x
  2. Step 2: Convert to fraction form
    1,389/2,642 = 2,642/x
  3. Step 3: Cross multiply
    1,389x = 2,642 × 2,642
  4. Step 4: Simplify right side
    1,389x = 6,980,164
  5. Step 5: Solve for x
    x = 6,980,164/1,389
  6. Step 6: Final answer
    x = 5,025.32

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Why These Related Problems?

These problems maintain the same ratio (1.90) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.