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Finding the Third Proportional to 5,215,905 and 7,978,758.75

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Solution

The third proportional to 5,215,905 and 7,978,758.75 is: 12,205,090.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,215,905 : 7,978,758.75 = 7,978,758.75 : x
  2. Step 2: Convert to fraction form
    5,215,905/7,978,758.75 = 7,978,758.75/x
  3. Step 3: Cross multiply
    5,215,905x = 7,978,758.75 × 7,978,758.75
  4. Step 4: Simplify right side
    5,215,905x = 63,660,591,190,701.56
  5. Step 5: Solve for x
    x = 63,660,591,190,701.56/5,215,905
  6. Step 6: Final answer
    x = 12,205,090.24

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.