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Finding the Fourth Proportional to 715,791.33, 987,810.86 and 393,509.54

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Solution

The fourth proportional to 715,791.33, 987,810.86 and 393,509.54 is: 543,053.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,791.33 : 987,810.86 = 393,509.54 : x
  2. Step 2: Convert to fraction form
    715,791.33/987,810.86 = 393,509.54/x
  3. Step 3: Cross multiply
    715,791.33x = 987,810.86 × 393,509.54
  4. Step 4: Simplify right side
    715,791.33x = 388,713,000,578.91
  5. Step 5: Solve for x
    x = 388,713,000,578.91/715,791.33
  6. Step 6: Final answer
    x = 543,053.52

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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.