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Finding the Fourth Proportional to 715,805.39, 987,830.30 and 393,523.61

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Solution

The fourth proportional to 715,805.39, 987,830.30 and 393,523.61 is: 543,072.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,805.39 : 987,830.30 = 393,523.61 : x
  2. Step 2: Convert to fraction form
    715,805.39/987,830.30 = 393,523.61/x
  3. Step 3: Cross multiply
    715,805.39x = 987,830.30 × 393,523.61
  4. Step 4: Simplify right side
    715,805.39x = 388,734,541,768.04
  5. Step 5: Solve for x
    x = 388,734,541,768.04/715,805.39
  6. Step 6: Final answer
    x = 543,072.94

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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.