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Finding the Fourth Proportional to 28,939,911.20, 43,409,866.80 and 11,891,808.80

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Solution

The fourth proportional to 28,939,911.20, 43,409,866.80 and 11,891,808.80 is: 17,837,713.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,939,911.20 : 43,409,866.80 = 11,891,808.80 : x
  2. Step 2: Convert to fraction form
    28,939,911.20/43,409,866.80 = 11,891,808.80/x
  3. Step 3: Cross multiply
    28,939,911.20x = 43,409,866.80 × 11,891,808.80
  4. Step 4: Simplify right side
    28,939,911.20x = 516,221,836,019,067.81
  5. Step 5: Solve for x
    x = 516,221,836,019,067.81/28,939,911.20
  6. Step 6: Final answer
    x = 17,837,713.20

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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.