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Finding the Fourth Proportional to 18,897,806.40, 28,346,709.60 and 12,851,188.80

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Solution

The fourth proportional to 18,897,806.40, 28,346,709.60 and 12,851,188.80 is: 19,276,783.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,897,806.40 : 28,346,709.60 = 12,851,188.80 : x
  2. Step 2: Convert to fraction form
    18,897,806.40/28,346,709.60 = 12,851,188.80/x
  3. Step 3: Cross multiply
    18,897,806.40x = 28,346,709.60 × 12,851,188.80
  4. Step 4: Simplify right side
    18,897,806.40x = 364,288,916,928,372.50
  5. Step 5: Solve for x
    x = 364,288,916,928,372.50/18,897,806.40
  6. Step 6: Final answer
    x = 19,276,783.20

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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.