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Finding the Fourth Proportional to 1,991,711.76, 2,741,917.98 and 1,900,201.20

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Solution

The fourth proportional to 1,991,711.76, 2,741,917.98 and 1,900,201.20 is: 2,615,938.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991,711.76 : 2,741,917.98 = 1,900,201.20 : x
  2. Step 2: Convert to fraction form
    1,991,711.76/2,741,917.98 = 1,900,201.20/x
  3. Step 3: Cross multiply
    1,991,711.76x = 2,741,917.98 × 1,900,201.20
  4. Step 4: Simplify right side
    1,991,711.76x = 5,210,195,835,897.58
  5. Step 5: Solve for x
    x = 5,210,195,835,897.58/1,991,711.76
  6. Step 6: Final answer
    x = 2,615,938.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.