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Finding the Fourth Proportional to 111.79, 167.69 and 68.49

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Solution

The fourth proportional to 111.79, 167.69 and 68.49 is: 102.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.79 : 167.69 = 68.49 : x
  2. Step 2: Convert to fraction form
    111.79/167.69 = 68.49/x
  3. Step 3: Cross multiply
    111.79x = 167.69 × 68.49
  4. Step 4: Simplify right side
    111.79x = 11,485.09
  5. Step 5: Solve for x
    x = 11,485.09/111.79
  6. Step 6: Final answer
    x = 102.74

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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.