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Finding the Fourth Proportional to 391,176,010.40, 586,764,015.60 and 197,012,400.80

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Solution

The fourth proportional to 391,176,010.40, 586,764,015.60 and 197,012,400.80 is: 295,518,601.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,176,010.40 : 586,764,015.60 = 197,012,400.80 : x
  2. Step 2: Convert to fraction form
    391,176,010.40/586,764,015.60 = 197,012,400.80/x
  3. Step 3: Cross multiply
    391,176,010.40x = 586,764,015.60 × 197,012,400.80
  4. Step 4: Simplify right side
    391,176,010.40x = 115,599,787,416,404,672
  5. Step 5: Solve for x
    x = 115,599,787,416,404,672/391,176,010.40
  6. Step 6: Final answer
    x = 295,518,601.20

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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.