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Finding the Fourth Proportional to 715,884.78, 987,927.78 and 393,597.12

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Solution

The fourth proportional to 715,884.78, 987,927.78 and 393,597.12 is: 543,167.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,884.78 : 987,927.78 = 393,597.12 : x
  2. Step 2: Convert to fraction form
    715,884.78/987,927.78 = 393,597.12/x
  3. Step 3: Cross multiply
    715,884.78x = 987,927.78 × 393,597.12
  4. Step 4: Simplify right side
    715,884.78x = 388,845,528,975.99
  5. Step 5: Solve for x
    x = 388,845,528,975.99/715,884.78
  6. Step 6: Final answer
    x = 543,167.76

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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.