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Finding the Fourth Proportional to 20,190.60, 30,303.90 and 11,860.20

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Solution

The fourth proportional to 20,190.60, 30,303.90 and 11,860.20 is: 17,800.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,190.60 : 30,303.90 = 11,860.20 : x
  2. Step 2: Convert to fraction form
    20,190.60/30,303.90 = 11,860.20/x
  3. Step 3: Cross multiply
    20,190.60x = 30,303.90 × 11,860.20
  4. Step 4: Simplify right side
    20,190.60x = 359,410,314.78
  5. Step 5: Solve for x
    x = 359,410,314.78/20,190.60
  6. Step 6: Final answer
    x = 17,800.87

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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.