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Finding the Fourth Proportional to 80,999.80, 121,629.30 and 54,820.60

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Solution

The fourth proportional to 80,999.80, 121,629.30 and 54,820.60 is: 82,318.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,999.80 : 121,629.30 = 54,820.60 : x
  2. Step 2: Convert to fraction form
    80,999.80/121,629.30 = 54,820.60/x
  3. Step 3: Cross multiply
    80,999.80x = 121,629.30 × 54,820.60
  4. Step 4: Simplify right side
    80,999.80x = 6,667,791,203.58
  5. Step 5: Solve for x
    x = 6,667,791,203.58/80,999.80
  6. Step 6: Final answer
    x = 82,318.61

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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.