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Finding the Fourth Proportional to 111.91, 167.80 and 68.59

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Solution

The fourth proportional to 111.91, 167.80 and 68.59 is: 102.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.91 : 167.80 = 68.59 : x
  2. Step 2: Convert to fraction form
    111.91/167.80 = 68.59/x
  3. Step 3: Cross multiply
    111.91x = 167.80 × 68.59
  4. Step 4: Simplify right side
    111.91x = 11,508.81
  5. Step 5: Solve for x
    x = 11,508.81/111.91
  6. Step 6: Final answer
    x = 102.84

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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.