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Finding the Fourth Proportional to 18,928,687.20, 28,393,030.80 and 11,370,415.20

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Solution

The fourth proportional to 18,928,687.20, 28,393,030.80 and 11,370,415.20 is: 17,055,622.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928,687.20 : 28,393,030.80 = 11,370,415.20 : x
  2. Step 2: Convert to fraction form
    18,928,687.20/28,393,030.80 = 11,370,415.20/x
  3. Step 3: Cross multiply
    18,928,687.20x = 28,393,030.80 × 11,370,415.20
  4. Step 4: Simplify right side
    18,928,687.20x = 322,840,548,982,388.12
  5. Step 5: Solve for x
    x = 322,840,548,982,388.12/18,928,687.20
  6. Step 6: Final answer
    x = 17,055,622.80

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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.