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Finding the Fourth Proportional to 578,768.40, 866,986.20 and 389,811.60

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Solution

The fourth proportional to 578,768.40, 866,986.20 and 389,811.60 is: 583,931.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,768.40 : 866,986.20 = 389,811.60 : x
  2. Step 2: Convert to fraction form
    578,768.40/866,986.20 = 389,811.60/x
  3. Step 3: Cross multiply
    578,768.40x = 866,986.20 × 389,811.60
  4. Step 4: Simplify right side
    578,768.40x = 337,961,277,799.92
  5. Step 5: Solve for x
    x = 337,961,277,799.92/578,768.40
  6. Step 6: Final answer
    x = 583,931.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.