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Finding the Third Proportional to 3,969 and 8,465.20

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Solution

The third proportional to 3,969 and 8,465.20 is: 18,054.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,969 : 8,465.20 = 8,465.20 : x
  2. Step 2: Convert to fraction form
    3,969/8,465.20 = 8,465.20/x
  3. Step 3: Cross multiply
    3,969x = 8,465.20 × 8,465.20
  4. Step 4: Simplify right side
    3,969x = 71,659,663.95
  5. Step 5: Solve for x
    x = 71,659,663.95/3,969
  6. Step 6: Final answer
    x = 18,054.84

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.