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Finding the Fourth Proportional to 81,110.80, 121,608.60 and 31,171.60

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Solution

The fourth proportional to 81,110.80, 121,608.60 and 31,171.60 is: 46,735.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,110.80 : 121,608.60 = 31,171.60 : x
  2. Step 2: Convert to fraction form
    81,110.80/121,608.60 = 31,171.60/x
  3. Step 3: Cross multiply
    81,110.80x = 121,608.60 × 31,171.60
  4. Step 4: Simplify right side
    81,110.80x = 3,790,734,635.76
  5. Step 5: Solve for x
    x = 3,790,734,635.76/81,110.80
  6. Step 6: Final answer
    x = 46,735.26

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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.