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Finding the Fourth Proportional to 1,987,770.98, 2,981,938.35 and 639,620.35

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Solution

The fourth proportional to 1,987,770.98, 2,981,938.35 and 639,620.35 is: 959,521.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987,770.98 : 2,981,938.35 = 639,620.35 : x
  2. Step 2: Convert to fraction form
    1,987,770.98/2,981,938.35 = 639,620.35/x
  3. Step 3: Cross multiply
    1,987,770.98x = 2,981,938.35 × 639,620.35
  4. Step 4: Simplify right side
    1,987,770.98x = 1,907,308,446,049.15
  5. Step 5: Solve for x
    x = 1,907,308,446,049.15/1,987,770.98
  6. Step 6: Final answer
    x = 959,521.22

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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.