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Finding the Fourth Proportional to 198,685.60, 298,081.20 and 86,317.60

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Solution

The fourth proportional to 198,685.60, 298,081.20 and 86,317.60 is: 129,499.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,685.60 : 298,081.20 = 86,317.60 : x
  2. Step 2: Convert to fraction form
    198,685.60/298,081.20 = 86,317.60/x
  3. Step 3: Cross multiply
    198,685.60x = 298,081.20 × 86,317.60
  4. Step 4: Simplify right side
    198,685.60x = 25,729,653,789.12
  5. Step 5: Solve for x
    x = 25,729,653,789.12/198,685.60
  6. Step 6: Final answer
    x = 129,499.34

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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.