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Finding the Fourth Proportional to 686,620.80, 947,440.80 and 396,316.80

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Solution

The fourth proportional to 686,620.80, 947,440.80 and 396,316.80 is: 546,861.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,620.80 : 947,440.80 = 396,316.80 : x
  2. Step 2: Convert to fraction form
    686,620.80/947,440.80 = 396,316.80/x
  3. Step 3: Cross multiply
    686,620.80x = 947,440.80 × 396,316.80
  4. Step 4: Simplify right side
    686,620.80x = 375,486,706,045.44
  5. Step 5: Solve for x
    x = 375,486,706,045.44/686,620.80
  6. Step 6: Final answer
    x = 546,861.83

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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.