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Finding the Fourth Proportional to 69,959.78, 104,908.70 and 20,028.50

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Solution

The fourth proportional to 69,959.78, 104,908.70 and 20,028.50 is: 30,033.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,959.78 : 104,908.70 = 20,028.50 : x
  2. Step 2: Convert to fraction form
    69,959.78/104,908.70 = 20,028.50/x
  3. Step 3: Cross multiply
    69,959.78x = 104,908.70 × 20,028.50
  4. Step 4: Simplify right side
    69,959.78x = 2,101,163,423.48
  5. Step 5: Solve for x
    x = 2,101,163,423.48/69,959.78
  6. Step 6: Final answer
    x = 30,033.88

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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.