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Finding the Fourth Proportional to 111.22, 166.68 and 89.62

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Solution

The fourth proportional to 111.22, 166.68 and 89.62 is: 134.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.22 : 166.68 = 89.62 : x
  2. Step 2: Convert to fraction form
    111.22/166.68 = 89.62/x
  3. Step 3: Cross multiply
    111.22x = 166.68 × 89.62
  4. Step 4: Simplify right side
    111.22x = 14,937.86
  5. Step 5: Solve for x
    x = 14,937.86/111.22
  6. Step 6: Final answer
    x = 134.31

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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.