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Finding the Fourth Proportional to 691,997.60, 954,963.60 and 405,687.20

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Solution

The fourth proportional to 691,997.60, 954,963.60 and 405,687.20 is: 559,852.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,997.60 : 954,963.60 = 405,687.20 : x
  2. Step 2: Convert to fraction form
    691,997.60/954,963.60 = 405,687.20/x
  3. Step 3: Cross multiply
    691,997.60x = 954,963.60 × 405,687.20
  4. Step 4: Simplify right side
    691,997.60x = 387,416,508,985.92
  5. Step 5: Solve for x
    x = 387,416,508,985.92/691,997.60
  6. Step 6: Final answer
    x = 559,852.39

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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.