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Finding the Fourth Proportional to 20,563.87, 30,858.09 and 18,890.80

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Solution

The fourth proportional to 20,563.87, 30,858.09 and 18,890.80 is: 28,347.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,563.87 : 30,858.09 = 18,890.80 : x
  2. Step 2: Convert to fraction form
    20,563.87/30,858.09 = 18,890.80/x
  3. Step 3: Cross multiply
    20,563.87x = 30,858.09 × 18,890.80
  4. Step 4: Simplify right side
    20,563.87x = 582,934,006.57
  5. Step 5: Solve for x
    x = 582,934,006.57/20,563.87
  6. Step 6: Final answer
    x = 28,347.49

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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.