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Finding the Fourth Proportional to 699,890.72, 965,867.26 and 393,978.05

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Solution

The fourth proportional to 699,890.72, 965,867.26 and 393,978.05 is: 543,699.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    699,890.72 : 965,867.26 = 393,978.05 : x
  2. Step 2: Convert to fraction form
    699,890.72/965,867.26 = 393,978.05/x
  3. Step 3: Cross multiply
    699,890.72x = 965,867.26 × 393,978.05
  4. Step 4: Simplify right side
    699,890.72x = 380,530,499,653.64
  5. Step 5: Solve for x
    x = 380,530,499,653.64/699,890.72
  6. Step 6: Final answer
    x = 543,699.88

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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.