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Finding the Fourth Proportional to 325,998.60, 488,997.90 and 215,190.60

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Solution

The fourth proportional to 325,998.60, 488,997.90 and 215,190.60 is: 322,785.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    325,998.60 : 488,997.90 = 215,190.60 : x
  2. Step 2: Convert to fraction form
    325,998.60/488,997.90 = 215,190.60/x
  3. Step 3: Cross multiply
    325,998.60x = 488,997.90 × 215,190.60
  4. Step 4: Simplify right side
    325,998.60x = 105,227,751,499.74
  5. Step 5: Solve for x
    x = 105,227,751,499.74/325,998.60
  6. Step 6: Final answer
    x = 322,785.90

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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.