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Finding the Fourth Proportional to 13,920,774.78, 19,212,978.03 and 8,119,556.34

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Solution

The fourth proportional to 13,920,774.78, 19,212,978.03 and 8,119,556.34 is: 11,206,334.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920,774.78 : 19,212,978.03 = 8,119,556.34 : x
  2. Step 2: Convert to fraction form
    13,920,774.78/19,212,978.03 = 8,119,556.34/x
  3. Step 3: Cross multiply
    13,920,774.78x = 19,212,978.03 × 8,119,556.34
  4. Step 4: Simplify right side
    13,920,774.78x = 156,000,857,573,767.22
  5. Step 5: Solve for x
    x = 156,000,857,573,767.22/13,920,774.78
  6. Step 6: Final answer
    x = 11,206,334.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.