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Finding the Fourth Proportional to 80,940.66, 111,698.16 and 45,129.86

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Solution

The fourth proportional to 80,940.66, 111,698.16 and 45,129.86 is: 62,279.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,940.66 : 111,698.16 = 45,129.86 : x
  2. Step 2: Convert to fraction form
    80,940.66/111,698.16 = 45,129.86/x
  3. Step 3: Cross multiply
    80,940.66x = 111,698.16 × 45,129.86
  4. Step 4: Simplify right side
    80,940.66x = 5,040,922,323.06
  5. Step 5: Solve for x
    x = 5,040,922,323.06/80,940.66
  6. Step 6: Final answer
    x = 62,279.23

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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.