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Finding the Third Proportional to 18,428,913 and 39,990,387

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Solution

The third proportional to 18,428,913 and 39,990,387 is: 86,778,371.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,428,913 : 39,990,387 = 39,990,387 : x
  2. Step 2: Convert to fraction form
    18,428,913/39,990,387 = 39,990,387/x
  3. Step 3: Cross multiply
    18,428,913x = 39,990,387 × 39,990,387
  4. Step 4: Simplify right side
    18,428,913x = 1,599,231,052,409,769
  5. Step 5: Solve for x
    x = 1,599,231,052,409,769/18,428,913
  6. Step 6: Final answer
    x = 86,778,371.16

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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.