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Finding the Fourth Proportional to 640,688.62, 884,071.11 and 354,214.30

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Solution

The fourth proportional to 640,688.62, 884,071.11 and 354,214.30 is: 488,771.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,688.62 : 884,071.11 = 354,214.30 : x
  2. Step 2: Convert to fraction form
    640,688.62/884,071.11 = 354,214.30/x
  3. Step 3: Cross multiply
    640,688.62x = 884,071.11 × 354,214.30
  4. Step 4: Simplify right side
    640,688.62x = 313,150,629,378.87
  5. Step 5: Solve for x
    x = 313,150,629,378.87/640,688.62
  6. Step 6: Final answer
    x = 488,771.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.