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Finding the Fourth Proportional to 715,919.56, 987,971.52 and 393,649.92

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Solution

The fourth proportional to 715,919.56, 987,971.52 and 393,649.92 is: 543,238.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,919.56 : 987,971.52 = 393,649.92 : x
  2. Step 2: Convert to fraction form
    715,919.56/987,971.52 = 393,649.92/x
  3. Step 3: Cross multiply
    715,919.56x = 987,971.52 × 393,649.92
  4. Step 4: Simplify right side
    715,919.56x = 388,914,912,280.21
  5. Step 5: Solve for x
    x = 388,914,912,280.21/715,919.56
  6. Step 6: Final answer
    x = 543,238.28

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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.