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Finding the Fourth Proportional to 138,611.43, 206,914.37 and 121,796.28

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Solution

The fourth proportional to 138,611.43, 206,914.37 and 121,796.28 is: 181,813.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,611.43 : 206,914.37 = 121,796.28 : x
  2. Step 2: Convert to fraction form
    138,611.43/206,914.37 = 121,796.28/x
  3. Step 3: Cross multiply
    138,611.43x = 206,914.37 × 121,796.28
  4. Step 4: Simplify right side
    138,611.43x = 25,201,399,935.56
  5. Step 5: Solve for x
    x = 25,201,399,935.56/138,611.43
  6. Step 6: Final answer
    x = 181,813.29

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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.