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Finding the Fourth Proportional to 715,794.23, 987,814.91 and 393,512.45

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Solution

The fourth proportional to 715,794.23, 987,814.91 and 393,512.45 is: 543,057.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,794.23 : 987,814.91 = 393,512.45 : x
  2. Step 2: Convert to fraction form
    715,794.23/987,814.91 = 393,512.45/x
  3. Step 3: Cross multiply
    715,794.23x = 987,814.91 × 393,512.45
  4. Step 4: Simplify right side
    715,794.23x = 388,717,465,380.63
  5. Step 5: Solve for x
    x = 388,717,465,380.63/715,794.23
  6. Step 6: Final answer
    x = 543,057.56

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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.