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Finding the Fourth Proportional to 140.88, 194.49 and 111.72

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Solution

The fourth proportional to 140.88, 194.49 and 111.72 is: 154.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.88 : 194.49 = 111.72 : x
  2. Step 2: Convert to fraction form
    140.88/194.49 = 111.72/x
  3. Step 3: Cross multiply
    140.88x = 194.49 × 111.72
  4. Step 4: Simplify right side
    140.88x = 21,728.42
  5. Step 5: Solve for x
    x = 21,728.42/140.88
  6. Step 6: Final answer
    x = 154.23

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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.