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Finding the Fourth Proportional to 20,193.19, 27,865.20 and 12,639.19

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Solution

The fourth proportional to 20,193.19, 27,865.20 and 12,639.19 is: 17,441.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,193.19 : 27,865.20 = 12,639.19 : x
  2. Step 2: Convert to fraction form
    20,193.19/27,865.20 = 12,639.19/x
  3. Step 3: Cross multiply
    20,193.19x = 27,865.20 × 12,639.19
  4. Step 4: Simplify right side
    20,193.19x = 352,193,557.19
  5. Step 5: Solve for x
    x = 352,193,557.19/20,193.19
  6. Step 6: Final answer
    x = 17,441.20

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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.