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Finding the Fourth Proportional to 138,362.73, 190,940.85 and 80,991.69

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Solution

The fourth proportional to 138,362.73, 190,940.85 and 80,991.69 is: 111,768.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,362.73 : 190,940.85 = 80,991.69 : x
  2. Step 2: Convert to fraction form
    138,362.73/190,940.85 = 80,991.69/x
  3. Step 3: Cross multiply
    138,362.73x = 190,940.85 × 80,991.69
  4. Step 4: Simplify right side
    138,362.73x = 15,464,622,131.54
  5. Step 5: Solve for x
    x = 15,464,622,131.54/138,362.73
  6. Step 6: Final answer
    x = 111,768.70

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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.