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Finding the Fourth Proportional to 640,078.92, 960,118.38 and 439,792.11

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Solution

The fourth proportional to 640,078.92, 960,118.38 and 439,792.11 is: 659,688.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,078.92 : 960,118.38 = 439,792.11 : x
  2. Step 2: Convert to fraction form
    640,078.92/960,118.38 = 439,792.11/x
  3. Step 3: Cross multiply
    640,078.92x = 960,118.38 × 439,792.11
  4. Step 4: Simplify right side
    640,078.92x = 422,252,488,189.98
  5. Step 5: Solve for x
    x = 422,252,488,189.98/640,078.92
  6. Step 6: Final answer
    x = 659,688.17

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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.