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Finding the Fourth Proportional to 18,909.80, 28,355.20 and 11,014.92

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Solution

The fourth proportional to 18,909.80, 28,355.20 and 11,014.92 is: 16,516.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.80 : 28,355.20 = 11,014.92 : x
  2. Step 2: Convert to fraction form
    18,909.80/28,355.20 = 11,014.92/x
  3. Step 3: Cross multiply
    18,909.80x = 28,355.20 × 11,014.92
  4. Step 4: Simplify right side
    18,909.80x = 312,330,259.58
  5. Step 5: Solve for x
    x = 312,330,259.58/18,909.80
  6. Step 6: Final answer
    x = 16,516.85

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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.