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Finding the Third Proportional to 18,428,940 and 39,990,440

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Solution

The third proportional to 18,428,940 and 39,990,440 is: 86,778,474.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,428,940 : 39,990,440 = 39,990,440 : x
  2. Step 2: Convert to fraction form
    18,428,940/39,990,440 = 39,990,440/x
  3. Step 3: Cross multiply
    18,428,940x = 39,990,440 × 39,990,440
  4. Step 4: Simplify right side
    18,428,940x = 1,599,235,291,393,600
  5. Step 5: Solve for x
    x = 1,599,235,291,393,600/18,428,940
  6. Step 6: Final answer
    x = 86,778,474.04

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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.