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Finding the Fourth Proportional to 1,978,353.22, 2,965,979.58 and 781,171.66

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Solution

The fourth proportional to 1,978,353.22, 2,965,979.58 and 781,171.66 is: 1,171,145.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978,353.22 : 2,965,979.58 = 781,171.66 : x
  2. Step 2: Convert to fraction form
    1,978,353.22/2,965,979.58 = 781,171.66/x
  3. Step 3: Cross multiply
    1,978,353.22x = 2,965,979.58 × 781,171.66
  4. Step 4: Simplify right side
    1,978,353.22x = 2,316,939,192,034.70
  5. Step 5: Solve for x
    x = 2,316,939,192,034.70/1,978,353.22
  6. Step 6: Final answer
    x = 1,171,145.36

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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.