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Finding the Fourth Proportional to 691,900.89, 954,801.57 and 405,611.65

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Solution

The fourth proportional to 691,900.89, 954,801.57 and 405,611.65 is: 559,731.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,900.89 : 954,801.57 = 405,611.65 : x
  2. Step 2: Convert to fraction form
    691,900.89/954,801.57 = 405,611.65/x
  3. Step 3: Cross multiply
    691,900.89x = 954,801.57 × 405,611.65
  4. Step 4: Simplify right side
    691,900.89x = 387,278,640,230.29
  5. Step 5: Solve for x
    x = 387,278,640,230.29/691,900.89
  6. Step 6: Final answer
    x = 559,731.38

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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.