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Finding the Third Proportional to 421,790 and 911,026

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Solution

The third proportional to 421,790 and 911,026 is: 1,967,728.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,790 : 911,026 = 911,026 : x
  2. Step 2: Convert to fraction form
    421,790/911,026 = 911,026/x
  3. Step 3: Cross multiply
    421,790x = 911,026 × 911,026
  4. Step 4: Simplify right side
    421,790x = 829,968,372,676
  5. Step 5: Solve for x
    x = 829,968,372,676/421,790
  6. Step 6: Final answer
    x = 1,967,728.90

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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.