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Finding the Fourth Proportional to 20,080.20, 30,185.10 and 18,913.80

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Solution

The fourth proportional to 20,080.20, 30,185.10 and 18,913.80 is: 28,431.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,080.20 : 30,185.10 = 18,913.80 : x
  2. Step 2: Convert to fraction form
    20,080.20/30,185.10 = 18,913.80/x
  3. Step 3: Cross multiply
    20,080.20x = 30,185.10 × 18,913.80
  4. Step 4: Simplify right side
    20,080.20x = 570,914,944.38
  5. Step 5: Solve for x
    x = 570,914,944.38/20,080.20
  6. Step 6: Final answer
    x = 28,431.74

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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.