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Finding the Fourth Proportional to 691,976.39, 954,905.76 and 405,687.15

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Solution

The fourth proportional to 691,976.39, 954,905.76 and 405,687.15 is: 559,835.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,976.39 : 954,905.76 = 405,687.15 : x
  2. Step 2: Convert to fraction form
    691,976.39/954,905.76 = 405,687.15/x
  3. Step 3: Cross multiply
    691,976.39x = 954,905.76 × 405,687.15
  4. Step 4: Simplify right side
    691,976.39x = 387,392,996,292.98
  5. Step 5: Solve for x
    x = 387,392,996,292.98/691,976.39
  6. Step 6: Final answer
    x = 559,835.57

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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.