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Finding the Fourth Proportional to 578,769.40, 866,987.70 and 389,812.60

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Solution

The fourth proportional to 578,769.40, 866,987.70 and 389,812.60 is: 583,933.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,769.40 : 866,987.70 = 389,812.60 : x
  2. Step 2: Convert to fraction form
    578,769.40/866,987.70 = 389,812.60/x
  3. Step 3: Cross multiply
    578,769.40x = 866,987.70 × 389,812.60
  4. Step 4: Simplify right side
    578,769.40x = 337,962,729,505.02
  5. Step 5: Solve for x
    x = 337,962,729,505.02/578,769.40
  6. Step 6: Final answer
    x = 583,933.31

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1.5x scale

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.