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Finding the Fourth Proportional to 685,390.76, 945,839.12 and 383,584.76

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Solution

The fourth proportional to 685,390.76, 945,839.12 and 383,584.76 is: 529,346.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,390.76 : 945,839.12 = 383,584.76 : x
  2. Step 2: Convert to fraction form
    685,390.76/945,839.12 = 383,584.76/x
  3. Step 3: Cross multiply
    685,390.76x = 945,839.12 × 383,584.76
  4. Step 4: Simplify right side
    685,390.76x = 362,809,471,843.81
  5. Step 5: Solve for x
    x = 362,809,471,843.81/685,390.76
  6. Step 6: Final answer
    x = 529,346.90

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Half scale
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Double scale
Find fourth proportional to 685,391.76, 945,840.50 and 383,585.76
Similar ratio
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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.