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Finding the Third Proportional to 689.50 and 1,621

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Solution

The third proportional to 689.50 and 1,621 is: 3,810.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.50 : 1,621 = 1,621 : x
  2. Step 2: Convert to fraction form
    689.50/1,621 = 1,621/x
  3. Step 3: Cross multiply
    689.50x = 1,621 × 1,621
  4. Step 4: Simplify right side
    689.50x = 2,627,641
  5. Step 5: Solve for x
    x = 2,627,641/689.50
  6. Step 6: Final answer
    x = 3,810.94

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Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.