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Finding the Fourth Proportional to 129,911.20, 194,769.60 and 70,813.60

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Solution

The fourth proportional to 129,911.20, 194,769.60 and 70,813.60 is: 106,167.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,911.20 : 194,769.60 = 70,813.60 : x
  2. Step 2: Convert to fraction form
    129,911.20/194,769.60 = 70,813.60/x
  3. Step 3: Cross multiply
    129,911.20x = 194,769.60 × 70,813.60
  4. Step 4: Simplify right side
    129,911.20x = 13,792,336,546.56
  5. Step 5: Solve for x
    x = 13,792,336,546.56/129,911.20
  6. Step 6: Final answer
    x = 106,167.42

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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.