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Finding the Third Proportional to 405,940 and 618,485

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Solution

The third proportional to 405,940 and 618,485 is: 942,315.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,940 : 618,485 = 618,485 : x
  2. Step 2: Convert to fraction form
    405,940/618,485 = 618,485/x
  3. Step 3: Cross multiply
    405,940x = 618,485 × 618,485
  4. Step 4: Simplify right side
    405,940x = 382,523,695,225
  5. Step 5: Solve for x
    x = 382,523,695,225/405,940
  6. Step 6: Final answer
    x = 942,315.85

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.