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Finding the Fourth Proportional to 203,828.40, 305,596.80 and 91,416.60

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Solution

The fourth proportional to 203,828.40, 305,596.80 and 91,416.60 is: 137,059.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,828.40 : 305,596.80 = 91,416.60 : x
  2. Step 2: Convert to fraction form
    203,828.40/305,596.80 = 91,416.60/x
  3. Step 3: Cross multiply
    203,828.40x = 305,596.80 × 91,416.60
  4. Step 4: Simplify right side
    203,828.40x = 27,936,620,426.88
  5. Step 5: Solve for x
    x = 27,936,620,426.88/203,828.40
  6. Step 6: Final answer
    x = 137,059.51

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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.