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Finding the Fourth Proportional to 121,993.60, 182,990.46 and 80,138.20

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Solution

The fourth proportional to 121,993.60, 182,990.46 and 80,138.20 is: 120,207.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,993.60 : 182,990.46 = 80,138.20 : x
  2. Step 2: Convert to fraction form
    121,993.60/182,990.46 = 80,138.20/x
  3. Step 3: Cross multiply
    121,993.60x = 182,990.46 × 80,138.20
  4. Step 4: Simplify right side
    121,993.60x = 14,664,526,081.57
  5. Step 5: Solve for x
    x = 14,664,526,081.57/121,993.60
  6. Step 6: Final answer
    x = 120,207.34

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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.