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Finding the Fourth Proportional to 20,137.80, 30,206.70 and 6,286.80

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Solution

The fourth proportional to 20,137.80, 30,206.70 and 6,286.80 is: 9,430.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,137.80 : 30,206.70 = 6,286.80 : x
  2. Step 2: Convert to fraction form
    20,137.80/30,206.70 = 6,286.80/x
  3. Step 3: Cross multiply
    20,137.80x = 30,206.70 × 6,286.80
  4. Step 4: Simplify right side
    20,137.80x = 189,903,481.56
  5. Step 5: Solve for x
    x = 189,903,481.56/20,137.80
  6. Step 6: Final answer
    x = 9,430.20

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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.