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Finding the Fourth Proportional to 111.78, 154.20 and 68.13

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Solution

The fourth proportional to 111.78, 154.20 and 68.13 is: 93.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.78 : 154.20 = 68.13 : x
  2. Step 2: Convert to fraction form
    111.78/154.20 = 68.13/x
  3. Step 3: Cross multiply
    111.78x = 154.20 × 68.13
  4. Step 4: Simplify right side
    111.78x = 10,505.65
  5. Step 5: Solve for x
    x = 10,505.65/111.78
  6. Step 6: Final answer
    x = 93.99

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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.