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Finding the Fourth Proportional to 198,688.60, 298,085.70 and 86,320.60

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Solution

The fourth proportional to 198,688.60, 298,085.70 and 86,320.60 is: 129,503.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,688.60 : 298,085.70 = 86,320.60 : x
  2. Step 2: Convert to fraction form
    198,688.60/298,085.70 = 86,320.60/x
  3. Step 3: Cross multiply
    198,688.60x = 298,085.70 × 86,320.60
  4. Step 4: Simplify right side
    198,688.60x = 25,730,936,475.42
  5. Step 5: Solve for x
    x = 25,730,936,475.42/198,688.60
  6. Step 6: Final answer
    x = 129,503.84

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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.