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Finding the Fourth Proportional to 667,504.17, 921,136.76 and 391,857.59

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Solution

The fourth proportional to 667,504.17, 921,136.76 and 391,857.59 is: 540,752.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,504.17 : 921,136.76 = 391,857.59 : x
  2. Step 2: Convert to fraction form
    667,504.17/921,136.76 = 391,857.59/x
  3. Step 3: Cross multiply
    667,504.17x = 921,136.76 × 391,857.59
  4. Step 4: Simplify right side
    667,504.17x = 360,954,430,834.01
  5. Step 5: Solve for x
    x = 360,954,430,834.01/667,504.17
  6. Step 6: Final answer
    x = 540,752.33

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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.