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Finding the Fourth Proportional to 665,005.20, 997,507.80 and 398,628.60

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Solution

The fourth proportional to 665,005.20, 997,507.80 and 398,628.60 is: 597,942.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,005.20 : 997,507.80 = 398,628.60 : x
  2. Step 2: Convert to fraction form
    665,005.20/997,507.80 = 398,628.60/x
  3. Step 3: Cross multiply
    665,005.20x = 997,507.80 × 398,628.60
  4. Step 4: Simplify right side
    665,005.20x = 397,635,137,803.08
  5. Step 5: Solve for x
    x = 397,635,137,803.08/665,005.20
  6. Step 6: Final answer
    x = 597,942.90

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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.