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Finding the Fourth Proportional to 681,435.75, 940,400.78 and 379,649.19

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Solution

The fourth proportional to 681,435.75, 940,400.78 and 379,649.19 is: 523,926.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,435.75 : 940,400.78 = 379,649.19 : x
  2. Step 2: Convert to fraction form
    681,435.75/940,400.78 = 379,649.19/x
  3. Step 3: Cross multiply
    681,435.75x = 940,400.78 × 379,649.19
  4. Step 4: Simplify right side
    681,435.75x = 357,022,392,504.12
  5. Step 5: Solve for x
    x = 357,022,392,504.12/681,435.75
  6. Step 6: Final answer
    x = 523,926.71

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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.