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Finding the Fourth Proportional to 81,858.60, 122,787.90 and 61,122.60

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Solution

The fourth proportional to 81,858.60, 122,787.90 and 61,122.60 is: 91,683.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,858.60 : 122,787.90 = 61,122.60 : x
  2. Step 2: Convert to fraction form
    81,858.60/122,787.90 = 61,122.60/x
  3. Step 3: Cross multiply
    81,858.60x = 122,787.90 × 61,122.60
  4. Step 4: Simplify right side
    81,858.60x = 7,505,115,696.54
  5. Step 5: Solve for x
    x = 7,505,115,696.54/81,858.60
  6. Step 6: Final answer
    x = 91,683.90

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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.