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Finding the Third Proportional to 421,915 and 909,800

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Solution

The third proportional to 421,915 and 909,800 is: 1,961,854.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,915 : 909,800 = 909,800 : x
  2. Step 2: Convert to fraction form
    421,915/909,800 = 909,800/x
  3. Step 3: Cross multiply
    421,915x = 909,800 × 909,800
  4. Step 4: Simplify right side
    421,915x = 827,736,040,000
  5. Step 5: Solve for x
    x = 827,736,040,000/421,915
  6. Step 6: Final answer
    x = 1,961,854.97

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.