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Finding the Fourth Proportional to 85,546.40, 128,076.60 and 80,891.60

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Solution

The fourth proportional to 85,546.40, 128,076.60 and 80,891.60 is: 121,107.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,546.40 : 128,076.60 = 80,891.60 : x
  2. Step 2: Convert to fraction form
    85,546.40/128,076.60 = 80,891.60/x
  3. Step 3: Cross multiply
    85,546.40x = 128,076.60 × 80,891.60
  4. Step 4: Simplify right side
    85,546.40x = 10,360,321,096.56
  5. Step 5: Solve for x
    x = 10,360,321,096.56/85,546.40
  6. Step 6: Final answer
    x = 121,107.62

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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.