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Finding the Fourth Proportional to 121,059.69, 166,993.21 and 72,648.62

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Solution

The fourth proportional to 121,059.69, 166,993.21 and 72,648.62 is: 100,213.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,059.69 : 166,993.21 = 72,648.62 : x
  2. Step 2: Convert to fraction form
    121,059.69/166,993.21 = 72,648.62/x
  3. Step 3: Cross multiply
    121,059.69x = 166,993.21 × 72,648.62
  4. Step 4: Simplify right side
    121,059.69x = 12,131,826,255.87
  5. Step 5: Solve for x
    x = 12,131,826,255.87/121,059.69
  6. Step 6: Final answer
    x = 100,213.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.