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Finding the Fourth Proportional to 715,677.78, 987,623.95 and 393,380.94

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Solution

The fourth proportional to 715,677.78, 987,623.95 and 393,380.94 is: 542,859.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,677.78 : 987,623.95 = 393,380.94 : x
  2. Step 2: Convert to fraction form
    715,677.78/987,623.95 = 393,380.94/x
  3. Step 3: Cross multiply
    715,677.78x = 987,623.95 × 393,380.94
  4. Step 4: Simplify right side
    715,677.78x = 388,512,437,817.51
  5. Step 5: Solve for x
    x = 388,512,437,817.51/715,677.78
  6. Step 6: Final answer
    x = 542,859.44

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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.