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Finding the Fourth Proportional to 69,940.60, 104,954.64 and 28,387.60

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Solution

The fourth proportional to 69,940.60, 104,954.64 and 28,387.60 is: 42,599.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,940.60 : 104,954.64 = 28,387.60 : x
  2. Step 2: Convert to fraction form
    69,940.60/104,954.64 = 28,387.60/x
  3. Step 3: Cross multiply
    69,940.60x = 104,954.64 × 28,387.60
  4. Step 4: Simplify right side
    69,940.60x = 2,979,410,338.46
  5. Step 5: Solve for x
    x = 2,979,410,338.46/69,940.60
  6. Step 6: Final answer
    x = 42,599.15

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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.