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Finding the Fourth Proportional to 20,081.70, 30,122.55 and 12,662.10

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Solution

The fourth proportional to 20,081.70, 30,122.55 and 12,662.10 is: 18,993.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,081.70 : 30,122.55 = 12,662.10 : x
  2. Step 2: Convert to fraction form
    20,081.70/30,122.55 = 12,662.10/x
  3. Step 3: Cross multiply
    20,081.70x = 30,122.55 × 12,662.10
  4. Step 4: Simplify right side
    20,081.70x = 381,414,740.36
  5. Step 5: Solve for x
    x = 381,414,740.36/20,081.70
  6. Step 6: Final answer
    x = 18,993.15

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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.