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Finding the Fourth Proportional to 664,560.20, 996,840.30 and 399,139.40

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Solution

The fourth proportional to 664,560.20, 996,840.30 and 399,139.40 is: 598,709.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,560.20 : 996,840.30 = 399,139.40 : x
  2. Step 2: Convert to fraction form
    664,560.20/996,840.30 = 399,139.40/x
  3. Step 3: Cross multiply
    664,560.20x = 996,840.30 × 399,139.40
  4. Step 4: Simplify right side
    664,560.20x = 397,878,239,237.82
  5. Step 5: Solve for x
    x = 397,878,239,237.82/664,560.20
  6. Step 6: Final answer
    x = 598,709.10

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Similar ratio
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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.