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Finding the Fourth Proportional to 20,003.80, 30,005.70 and 18,928.60

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Solution

The fourth proportional to 20,003.80, 30,005.70 and 18,928.60 is: 28,392.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,003.80 : 30,005.70 = 18,928.60 : x
  2. Step 2: Convert to fraction form
    20,003.80/30,005.70 = 18,928.60/x
  3. Step 3: Cross multiply
    20,003.80x = 30,005.70 × 18,928.60
  4. Step 4: Simplify right side
    20,003.80x = 567,965,893.02
  5. Step 5: Solve for x
    x = 567,965,893.02/20,003.80
  6. Step 6: Final answer
    x = 28,392.90

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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.