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Finding the Fourth Proportional to 716,322.78, 988,519.90 and 394,025.80

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Solution

The fourth proportional to 716,322.78, 988,519.90 and 394,025.80 is: 543,752.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,322.78 : 988,519.90 = 394,025.80 : x
  2. Step 2: Convert to fraction form
    716,322.78/988,519.90 = 394,025.80/x
  3. Step 3: Cross multiply
    716,322.78x = 988,519.90 × 394,025.80
  4. Step 4: Simplify right side
    716,322.78x = 389,502,344,413.42
  5. Step 5: Solve for x
    x = 389,502,344,413.42/716,322.78
  6. Step 6: Final answer
    x = 543,752.56

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Double scale
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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.