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Finding the Fourth Proportional to 685,287.45, 945,704.14 and 379,368.90

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Solution

The fourth proportional to 685,287.45, 945,704.14 and 379,368.90 is: 523,533.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,287.45 : 945,704.14 = 379,368.90 : x
  2. Step 2: Convert to fraction form
    685,287.45/945,704.14 = 379,368.90/x
  3. Step 3: Cross multiply
    685,287.45x = 945,704.14 × 379,368.90
  4. Step 4: Simplify right side
    685,287.45x = 358,770,738,368.82
  5. Step 5: Solve for x
    x = 358,770,738,368.82/685,287.45
  6. Step 6: Final answer
    x = 523,533.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.