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Finding the Fourth Proportional to 69,940.36, 104,921.42 and 28,390.28

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Solution

The fourth proportional to 69,940.36, 104,921.42 and 28,390.28 is: 42,589.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,940.36 : 104,921.42 = 28,390.28 : x
  2. Step 2: Convert to fraction form
    69,940.36/104,921.42 = 28,390.28/x
  3. Step 3: Cross multiply
    69,940.36x = 104,921.42 × 28,390.28
  4. Step 4: Simplify right side
    69,940.36x = 2,978,748,491.80
  5. Step 5: Solve for x
    x = 2,978,748,491.80/69,940.36
  6. Step 6: Final answer
    x = 42,589.84

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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.