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Finding the Fourth Proportional to 878,414, 1,317,621 and 279,376.40

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Solution

The fourth proportional to 878,414, 1,317,621 and 279,376.40 is: 419,064.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,414 : 1,317,621 = 279,376.40 : x
  2. Step 2: Convert to fraction form
    878,414/1,317,621 = 279,376.40/x
  3. Step 3: Cross multiply
    878,414x = 1,317,621 × 279,376.40
  4. Step 4: Simplify right side
    878,414x = 368,112,211,544.40
  5. Step 5: Solve for x
    x = 368,112,211,544.40/878,414
  6. Step 6: Final answer
    x = 419,064.60

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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.