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Finding the Third Proportional to 621.50 and 1,310.50

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Solution

The third proportional to 621.50 and 1,310.50 is: 2,763.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.50 : 1,310.50 = 1,310.50 : x
  2. Step 2: Convert to fraction form
    621.50/1,310.50 = 1,310.50/x
  3. Step 3: Cross multiply
    621.50x = 1,310.50 × 1,310.50
  4. Step 4: Simplify right side
    621.50x = 1,717,410.25
  5. Step 5: Solve for x
    x = 1,717,410.25/621.50
  6. Step 6: Final answer
    x = 2,763.33

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.