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Finding the Third Proportional to 420,660 and 912,296

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Solution

The third proportional to 420,660 and 912,296 is: 1,978,519.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,660 : 912,296 = 912,296 : x
  2. Step 2: Convert to fraction form
    420,660/912,296 = 912,296/x
  3. Step 3: Cross multiply
    420,660x = 912,296 × 912,296
  4. Step 4: Simplify right side
    420,660x = 832,283,991,616
  5. Step 5: Solve for x
    x = 832,283,991,616/420,660
  6. Step 6: Final answer
    x = 1,978,519.45

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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.