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Finding the Third Proportional to 291,620 and 421,444

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Solution

The third proportional to 291,620 and 421,444 is: 609,063.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,620 : 421,444 = 421,444 : x
  2. Step 2: Convert to fraction form
    291,620/421,444 = 421,444/x
  3. Step 3: Cross multiply
    291,620x = 421,444 × 421,444
  4. Step 4: Simplify right side
    291,620x = 177,615,045,136
  5. Step 5: Solve for x
    x = 177,615,045,136/291,620
  6. Step 6: Final answer
    x = 609,063.32

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.