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Finding the Fourth Proportional to 18,739.20, 28,108.80 and 17,961.60

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Solution

The fourth proportional to 18,739.20, 28,108.80 and 17,961.60 is: 26,942.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,739.20 : 28,108.80 = 17,961.60 : x
  2. Step 2: Convert to fraction form
    18,739.20/28,108.80 = 17,961.60/x
  3. Step 3: Cross multiply
    18,739.20x = 28,108.80 × 17,961.60
  4. Step 4: Simplify right side
    18,739.20x = 504,879,022.08
  5. Step 5: Solve for x
    x = 504,879,022.08/18,739.20
  6. Step 6: Final answer
    x = 26,942.40

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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.