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Finding the Third Proportional to 3,906 and 8,428.50

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Solution

The third proportional to 3,906 and 8,428.50 is: 18,187.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906 : 8,428.50 = 8,428.50 : x
  2. Step 2: Convert to fraction form
    3,906/8,428.50 = 8,428.50/x
  3. Step 3: Cross multiply
    3,906x = 8,428.50 × 8,428.50
  4. Step 4: Simplify right side
    3,906x = 71,039,612.25
  5. Step 5: Solve for x
    x = 71,039,612.25/3,906
  6. Step 6: Final answer
    x = 18,187.30

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.