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Finding the Fourth Proportional to 111.21, 166.91 and 72.68

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Solution

The fourth proportional to 111.21, 166.91 and 72.68 is: 109.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.21 : 166.91 = 72.68 : x
  2. Step 2: Convert to fraction form
    111.21/166.91 = 72.68/x
  3. Step 3: Cross multiply
    111.21x = 166.91 × 72.68
  4. Step 4: Simplify right side
    111.21x = 12,131.57
  5. Step 5: Solve for x
    x = 12,131.57/111.21
  6. Step 6: Final answer
    x = 109.08

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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.