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Finding the Fourth Proportional to 640,670.77, 884,144.12 and 354,209.31

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Solution

The fourth proportional to 640,670.77, 884,144.12 and 354,209.31 is: 488,819.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,670.77 : 884,144.12 = 354,209.31 : x
  2. Step 2: Convert to fraction form
    640,670.77/884,144.12 = 354,209.31/x
  3. Step 3: Cross multiply
    640,670.77x = 884,144.12 × 354,209.31
  4. Step 4: Simplify right side
    640,670.77x = 313,172,076,914.71
  5. Step 5: Solve for x
    x = 313,172,076,914.71/640,670.77
  6. Step 6: Final answer
    x = 488,819.05

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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.