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Finding the Fourth Proportional to 128,505.45, 191,838.44 and 111,694.95

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Solution

The fourth proportional to 128,505.45, 191,838.44 and 111,694.95 is: 166,743.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,505.45 : 191,838.44 = 111,694.95 : x
  2. Step 2: Convert to fraction form
    128,505.45/191,838.44 = 111,694.95/x
  3. Step 3: Cross multiply
    128,505.45x = 191,838.44 × 111,694.95
  4. Step 4: Simplify right side
    128,505.45x = 21,427,384,405.40
  5. Step 5: Solve for x
    x = 21,427,384,405.40/128,505.45
  6. Step 6: Final answer
    x = 166,743.00

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.