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Finding the Fourth Proportional to 86,511.80, 129,767.70 and 85,928.60

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Solution

The fourth proportional to 86,511.80, 129,767.70 and 85,928.60 is: 128,892.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,511.80 : 129,767.70 = 85,928.60 : x
  2. Step 2: Convert to fraction form
    86,511.80/129,767.70 = 85,928.60/x
  3. Step 3: Cross multiply
    86,511.80x = 129,767.70 × 85,928.60
  4. Step 4: Simplify right side
    86,511.80x = 11,150,756,786.22
  5. Step 5: Solve for x
    x = 11,150,756,786.22/86,511.80
  6. Step 6: Final answer
    x = 128,892.90

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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.