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Finding the Third Proportional to 18,428,912 and 39,990,388

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Solution

The third proportional to 18,428,912 and 39,990,388 is: 86,778,380.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,428,912 : 39,990,388 = 39,990,388 : x
  2. Step 2: Convert to fraction form
    18,428,912/39,990,388 = 39,990,388/x
  3. Step 3: Cross multiply
    18,428,912x = 39,990,388 × 39,990,388
  4. Step 4: Simplify right side
    18,428,912x = 1,599,231,132,390,544
  5. Step 5: Solve for x
    x = 1,599,231,132,390,544/18,428,912
  6. Step 6: Final answer
    x = 86,778,380.21

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.