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Finding the Fourth Proportional to 138,893.78, 191,499.21 and 113,374.22

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Solution

The fourth proportional to 138,893.78, 191,499.21 and 113,374.22 is: 156,314.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,893.78 : 191,499.21 = 113,374.22 : x
  2. Step 2: Convert to fraction form
    138,893.78/191,499.21 = 113,374.22/x
  3. Step 3: Cross multiply
    138,893.78x = 191,499.21 × 113,374.22
  4. Step 4: Simplify right side
    138,893.78x = 21,711,072,606.87
  5. Step 5: Solve for x
    x = 21,711,072,606.87/138,893.78
  6. Step 6: Final answer
    x = 156,314.22

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1.5x scale

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.