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Finding the Fourth Proportional to 715,872.78, 987,911.22 and 393,585.12

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Solution

The fourth proportional to 715,872.78, 987,911.22 and 393,585.12 is: 543,151.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,872.78 : 987,911.22 = 393,585.12 : x
  2. Step 2: Convert to fraction form
    715,872.78/987,911.22 = 393,585.12/x
  3. Step 3: Cross multiply
    715,872.78x = 987,911.22 × 393,585.12
  4. Step 4: Simplify right side
    715,872.78x = 388,827,156,073.05
  5. Step 5: Solve for x
    x = 388,827,156,073.05/715,872.78
  6. Step 6: Final answer
    x = 543,151.20

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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.