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Finding the Fourth Proportional to 407,941.20, 611,911.80 and 399,193.20

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Solution

The fourth proportional to 407,941.20, 611,911.80 and 399,193.20 is: 598,789.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,941.20 : 611,911.80 = 399,193.20 : x
  2. Step 2: Convert to fraction form
    407,941.20/611,911.80 = 399,193.20/x
  3. Step 3: Cross multiply
    407,941.20x = 611,911.80 × 399,193.20
  4. Step 4: Simplify right side
    407,941.20x = 244,271,029,559.76
  5. Step 5: Solve for x
    x = 244,271,029,559.76/407,941.20
  6. Step 6: Final answer
    x = 598,789.80

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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.