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Finding the Fourth Proportional to 19,489,978.28, 26,889,986.82 and 11,339,641.64

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Solution

The fourth proportional to 19,489,978.28, 26,889,986.82 and 11,339,641.64 is: 15,645,107.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,489,978.28 : 26,889,986.82 = 11,339,641.64 : x
  2. Step 2: Convert to fraction form
    19,489,978.28/26,889,986.82 = 11,339,641.64/x
  3. Step 3: Cross multiply
    19,489,978.28x = 26,889,986.82 × 11,339,641.64
  4. Step 4: Simplify right side
    19,489,978.28x = 304,922,814,243,123.19
  5. Step 5: Solve for x
    x = 304,922,814,243,123.19/19,489,978.28
  6. Step 6: Final answer
    x = 15,645,107.96

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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.