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Finding the Fourth Proportional to 111,931.80, 167,744.10 and 91,195.80

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Solution

The fourth proportional to 111,931.80, 167,744.10 and 91,195.80 is: 136,668.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,931.80 : 167,744.10 = 91,195.80 : x
  2. Step 2: Convert to fraction form
    111,931.80/167,744.10 = 91,195.80/x
  3. Step 3: Cross multiply
    111,931.80x = 167,744.10 × 91,195.80
  4. Step 4: Simplify right side
    111,931.80x = 15,297,557,394.78
  5. Step 5: Solve for x
    x = 15,297,557,394.78/111,931.80
  6. Step 6: Final answer
    x = 136,668.56

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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.