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Finding the Fourth Proportional to 18,738,019.60, 28,107,029.40 and 11,557,661.20

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Solution

The fourth proportional to 18,738,019.60, 28,107,029.40 and 11,557,661.20 is: 17,336,491.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,738,019.60 : 28,107,029.40 = 11,557,661.20 : x
  2. Step 2: Convert to fraction form
    18,738,019.60/28,107,029.40 = 11,557,661.20/x
  3. Step 3: Cross multiply
    18,738,019.60x = 28,107,029.40 × 11,557,661.20
  4. Step 4: Simplify right side
    18,738,019.60x = 324,851,523,143,639.25
  5. Step 5: Solve for x
    x = 324,851,523,143,639.25/18,738,019.60
  6. Step 6: Final answer
    x = 17,336,491.80

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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.