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Finding the Fourth Proportional to 69,991.20, 104,955.22 and 20,059.88

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Solution

The fourth proportional to 69,991.20, 104,955.22 and 20,059.88 is: 30,080.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,991.20 : 104,955.22 = 20,059.88 : x
  2. Step 2: Convert to fraction form
    69,991.20/104,955.22 = 20,059.88/x
  3. Step 3: Cross multiply
    69,991.20x = 104,955.22 × 20,059.88
  4. Step 4: Simplify right side
    69,991.20x = 2,105,389,118.57
  5. Step 5: Solve for x
    x = 2,105,389,118.57/69,991.20
  6. Step 6: Final answer
    x = 30,080.77

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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.