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Finding the Fourth Proportional to 18,936,009.20, 28,404,013.80 and 12,133,564.40

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Solution

The fourth proportional to 18,936,009.20, 28,404,013.80 and 12,133,564.40 is: 18,200,346.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,936,009.20 : 28,404,013.80 = 12,133,564.40 : x
  2. Step 2: Convert to fraction form
    18,936,009.20/28,404,013.80 = 12,133,564.40/x
  3. Step 3: Cross multiply
    18,936,009.20x = 28,404,013.80 × 12,133,564.40
  4. Step 4: Simplify right side
    18,936,009.20x = 344,641,930,660,788.75
  5. Step 5: Solve for x
    x = 344,641,930,660,788.75/18,936,009.20
  6. Step 6: Final answer
    x = 18,200,346.60

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1.5x scale

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.