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Finding the Fourth Proportional to 639,738,005.20, 957,906,396.60 and 639,738,005.20

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Solution

The fourth proportional to 639,738,005.20, 957,906,396.60 and 639,738,005.20 is: 957,906,396.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,738,005.20 : 957,906,396.60 = 639,738,005.20 : x
  2. Step 2: Convert to fraction form
    639,738,005.20/957,906,396.60 = 639,738,005.20/x
  3. Step 3: Cross multiply
    639,738,005.20x = 957,906,396.60 × 639,738,005.20
  4. Step 4: Simplify right side
    639,738,005.20x = 612,809,127,329,204,096
  5. Step 5: Solve for x
    x = 612,809,127,329,204,096/639,738,005.20
  6. Step 6: Final answer
    x = 957,906,396.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.