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Finding the Fourth Proportional to 685,396.76, 945,847.40 and 383,590.76

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Solution

The fourth proportional to 685,396.76, 945,847.40 and 383,590.76 is: 529,355.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,396.76 : 945,847.40 = 383,590.76 : x
  2. Step 2: Convert to fraction form
    685,396.76/945,847.40 = 383,590.76/x
  3. Step 3: Cross multiply
    685,396.76x = 945,847.40 × 383,590.76
  4. Step 4: Simplify right side
    685,396.76x = 362,818,323,010.02
  5. Step 5: Solve for x
    x = 362,818,323,010.02/685,396.76
  6. Step 6: Final answer
    x = 529,355.18

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Half scale
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Double scale
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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.