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Finding the Third Proportional to 390,861,621 and 859,188,240

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Solution

The third proportional to 390,861,621 and 859,188,240 is: 1,888,659,290.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,861,621 : 859,188,240 = 859,188,240 : x
  2. Step 2: Convert to fraction form
    390,861,621/859,188,240 = 859,188,240/x
  3. Step 3: Cross multiply
    390,861,621x = 859,188,240 × 859,188,240
  4. Step 4: Simplify right side
    390,861,621x = 738,204,431,754,297,600
  5. Step 5: Solve for x
    x = 738,204,431,754,297,600/390,861,621
  6. Step 6: Final answer
    x = 1,888,659,290.38

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.