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Finding the Fourth Proportional to 715,873.78, 987,912.60 and 393,586.12

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Solution

The fourth proportional to 715,873.78, 987,912.60 and 393,586.12 is: 543,152.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,873.78 : 987,912.60 = 393,586.12 : x
  2. Step 2: Convert to fraction form
    715,873.78/987,912.60 = 393,586.12/x
  3. Step 3: Cross multiply
    715,873.78x = 987,912.60 × 393,586.12
  4. Step 4: Simplify right side
    715,873.78x = 388,828,687,133.11
  5. Step 5: Solve for x
    x = 388,828,687,133.11/715,873.78
  6. Step 6: Final answer
    x = 543,152.58

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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.