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Finding the Fourth Proportional to 669,398.63, 923,640.20 and 397,551.80

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Solution

The fourth proportional to 669,398.63, 923,640.20 and 397,551.80 is: 548,544.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    669,398.63 : 923,640.20 = 397,551.80 : x
  2. Step 2: Convert to fraction form
    669,398.63/923,640.20 = 397,551.80/x
  3. Step 3: Cross multiply
    669,398.63x = 923,640.20 × 397,551.80
  4. Step 4: Simplify right side
    669,398.63x = 367,194,820,679.05
  5. Step 5: Solve for x
    x = 367,194,820,679.05/669,398.63
  6. Step 6: Final answer
    x = 548,544.33

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Double scale
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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.