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Finding the Fourth Proportional to 19,189.60, 28,719.60 and 16,856.80

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Solution

The fourth proportional to 19,189.60, 28,719.60 and 16,856.80 is: 25,228.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,189.60 : 28,719.60 = 16,856.80 : x
  2. Step 2: Convert to fraction form
    19,189.60/28,719.60 = 16,856.80/x
  3. Step 3: Cross multiply
    19,189.60x = 28,719.60 × 16,856.80
  4. Step 4: Simplify right side
    19,189.60x = 484,120,553.28
  5. Step 5: Solve for x
    x = 484,120,553.28/19,189.60
  6. Step 6: Final answer
    x = 25,228.28

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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.