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Finding the Fourth Proportional to 111,921.80, 167,729.10 and 91,185.80

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Solution

The fourth proportional to 111,921.80, 167,729.10 and 91,185.80 is: 136,653.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,921.80 : 167,729.10 = 91,185.80 : x
  2. Step 2: Convert to fraction form
    111,921.80/167,729.10 = 91,185.80/x
  3. Step 3: Cross multiply
    111,921.80x = 167,729.10 × 91,185.80
  4. Step 4: Simplify right side
    111,921.80x = 15,294,512,166.78
  5. Step 5: Solve for x
    x = 15,294,512,166.78/111,921.80
  6. Step 6: Final answer
    x = 136,653.56

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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.