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Finding the Fourth Proportional to 678,737.84, 936,821.36 and 388,517.64

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Solution

The fourth proportional to 678,737.84, 936,821.36 and 388,517.64 is: 536,247.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,737.84 : 936,821.36 = 388,517.64 : x
  2. Step 2: Convert to fraction form
    678,737.84/936,821.36 = 388,517.64/x
  3. Step 3: Cross multiply
    678,737.84x = 936,821.36 × 388,517.64
  4. Step 4: Simplify right side
    678,737.84x = 363,971,623,888.79
  5. Step 5: Solve for x
    x = 363,971,623,888.79/678,737.84
  6. Step 6: Final answer
    x = 536,247.73

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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.