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Finding the Fourth Proportional to 665,087.70, 997,631.55 and 398,711.10

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Solution

The fourth proportional to 665,087.70, 997,631.55 and 398,711.10 is: 598,066.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,087.70 : 997,631.55 = 398,711.10 : x
  2. Step 2: Convert to fraction form
    665,087.70/997,631.55 = 398,711.10/x
  3. Step 3: Cross multiply
    665,087.70x = 997,631.55 × 398,711.10
  4. Step 4: Simplify right side
    665,087.70x = 397,766,772,695.21
  5. Step 5: Solve for x
    x = 397,766,772,695.21/665,087.70
  6. Step 6: Final answer
    x = 598,066.65

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Double scale
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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.