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Finding the Fourth Proportional to 18,866.96, 28,276.40 and 7,761.12

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Solution

The fourth proportional to 18,866.96, 28,276.40 and 7,761.12 is: 11,631.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,866.96 : 28,276.40 = 7,761.12 : x
  2. Step 2: Convert to fraction form
    18,866.96/28,276.40 = 7,761.12/x
  3. Step 3: Cross multiply
    18,866.96x = 28,276.40 × 7,761.12
  4. Step 4: Simplify right side
    18,866.96x = 219,456,533.57
  5. Step 5: Solve for x
    x = 219,456,533.57/18,866.96
  6. Step 6: Final answer
    x = 11,631.79

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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.