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Finding the Fourth Proportional to 665,136.80, 997,705.20 and 654,639.20

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Solution

The fourth proportional to 665,136.80, 997,705.20 and 654,639.20 is: 981,958.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,136.80 : 997,705.20 = 654,639.20 : x
  2. Step 2: Convert to fraction form
    665,136.80/997,705.20 = 654,639.20/x
  3. Step 3: Cross multiply
    665,136.80x = 997,705.20 × 654,639.20
  4. Step 4: Simplify right side
    665,136.80x = 653,136,933,963.84
  5. Step 5: Solve for x
    x = 653,136,933,963.84/665,136.80
  6. Step 6: Final answer
    x = 981,958.80

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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.