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Finding the Fourth Proportional to 191,978,308.17, 287,829,910.89 and 81,321,434.73

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Solution

The fourth proportional to 191,978,308.17, 287,829,910.89 and 81,321,434.73 is: 121,923,885.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,978,308.17 : 287,829,910.89 = 81,321,434.73 : x
  2. Step 2: Convert to fraction form
    191,978,308.17/287,829,910.89 = 81,321,434.73/x
  3. Step 3: Cross multiply
    191,978,308.17x = 287,829,910.89 × 81,321,434.73
  4. Step 4: Simplify right side
    191,978,308.17x = 23,406,741,311,782,852
  5. Step 5: Solve for x
    x = 23,406,741,311,782,852/191,978,308.17
  6. Step 6: Final answer
    x = 121,923,885.75

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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.