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Finding the Fourth Proportional to 641,416.60, 885,090.90 and 354,896.92

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Solution

The fourth proportional to 641,416.60, 885,090.90 and 354,896.92 is: 489,722.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,416.60 : 885,090.90 = 354,896.92 : x
  2. Step 2: Convert to fraction form
    641,416.60/885,090.90 = 354,896.92/x
  3. Step 3: Cross multiply
    641,416.60x = 885,090.90 × 354,896.92
  4. Step 4: Simplify right side
    641,416.60x = 314,116,034,330.03
  5. Step 5: Solve for x
    x = 314,116,034,330.03/641,416.60
  6. Step 6: Final answer
    x = 489,722.33

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Double scale
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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.