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Finding the Fourth Proportional to 878,399.64, 1,317,730.41 and 279,380.34

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Solution

The fourth proportional to 878,399.64, 1,317,730.41 and 279,380.34 is: 419,112.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,399.64 : 1,317,730.41 = 279,380.34 : x
  2. Step 2: Convert to fraction form
    878,399.64/1,317,730.41 = 279,380.34/x
  3. Step 3: Cross multiply
    878,399.64x = 1,317,730.41 × 279,380.34
  4. Step 4: Simplify right side
    878,399.64x = 368,147,969,974.14
  5. Step 5: Solve for x
    x = 368,147,969,974.14/878,399.64
  6. Step 6: Final answer
    x = 419,112.16

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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.