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Finding the Fourth Proportional to 18,781,319.20, 28,171,978.80 and 18,529,376.80

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Solution

The fourth proportional to 18,781,319.20, 28,171,978.80 and 18,529,376.80 is: 27,794,065.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781,319.20 : 28,171,978.80 = 18,529,376.80 : x
  2. Step 2: Convert to fraction form
    18,781,319.20/28,171,978.80 = 18,529,376.80/x
  3. Step 3: Cross multiply
    18,781,319.20x = 28,171,978.80 × 18,529,376.80
  4. Step 4: Simplify right side
    18,781,319.20x = 522,009,210,386,811.88
  5. Step 5: Solve for x
    x = 522,009,210,386,811.88/18,781,319.20
  6. Step 6: Final answer
    x = 27,794,065.20

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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.