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Finding the Fourth Proportional to 20,151.78, 30,191.41 and 18,965.80

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Solution

The fourth proportional to 20,151.78, 30,191.41 and 18,965.80 is: 28,414.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,151.78 : 30,191.41 = 18,965.80 : x
  2. Step 2: Convert to fraction form
    20,151.78/30,191.41 = 18,965.80/x
  3. Step 3: Cross multiply
    20,151.78x = 30,191.41 × 18,965.80
  4. Step 4: Simplify right side
    20,151.78x = 572,604,243.78
  5. Step 5: Solve for x
    x = 572,604,243.78/20,151.78
  6. Step 6: Final answer
    x = 28,414.57

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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.