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Finding the Fourth Proportional to 28,485.44, 42,735.48 and 20,489.42

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Solution

The fourth proportional to 28,485.44, 42,735.48 and 20,489.42 is: 30,739.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,485.44 : 42,735.48 = 20,489.42 : x
  2. Step 2: Convert to fraction form
    28,485.44/42,735.48 = 20,489.42/x
  3. Step 3: Cross multiply
    28,485.44x = 42,735.48 × 20,489.42
  4. Step 4: Simplify right side
    28,485.44x = 875,625,198.62
  5. Step 5: Solve for x
    x = 875,625,198.62/28,485.44
  6. Step 6: Final answer
    x = 30,739.40

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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.