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Finding the Fourth Proportional to 121,981.44, 168,410.79 and 78,391.67

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Solution

The fourth proportional to 121,981.44, 168,410.79 and 78,391.67 is: 108,229.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,981.44 : 168,410.79 = 78,391.67 : x
  2. Step 2: Convert to fraction form
    121,981.44/168,410.79 = 78,391.67/x
  3. Step 3: Cross multiply
    121,981.44x = 168,410.79 × 78,391.67
  4. Step 4: Simplify right side
    121,981.44x = 13,202,003,074.12
  5. Step 5: Solve for x
    x = 13,202,003,074.12/121,981.44
  6. Step 6: Final answer
    x = 108,229.61

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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.