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Finding the Fourth Proportional to 20,900.45, 28,843.11 and 11,948.78

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Solution

The fourth proportional to 20,900.45, 28,843.11 and 11,948.78 is: 16,489.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,900.45 : 28,843.11 = 11,948.78 : x
  2. Step 2: Convert to fraction form
    20,900.45/28,843.11 = 11,948.78/x
  3. Step 3: Cross multiply
    20,900.45x = 28,843.11 × 11,948.78
  4. Step 4: Simplify right side
    20,900.45x = 344,640,048.01
  5. Step 5: Solve for x
    x = 344,640,048.01/20,900.45
  6. Step 6: Final answer
    x = 16,489.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.