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Finding the Fourth Proportional to 120,905.20, 181,503.60 and 67,639.60

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Solution

The fourth proportional to 120,905.20, 181,503.60 and 67,639.60 is: 101,540.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,905.20 : 181,503.60 = 67,639.60 : x
  2. Step 2: Convert to fraction form
    120,905.20/181,503.60 = 67,639.60/x
  3. Step 3: Cross multiply
    120,905.20x = 181,503.60 × 67,639.60
  4. Step 4: Simplify right side
    120,905.20x = 12,276,830,902.56
  5. Step 5: Solve for x
    x = 12,276,830,902.56/120,905.20
  6. Step 6: Final answer
    x = 101,540.97

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1.5x scale

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.