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Finding the Fourth Proportional to 111.21, 166.67 and 53.39

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Solution

The fourth proportional to 111.21, 166.67 and 53.39 is: 80.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.21 : 166.67 = 53.39 : x
  2. Step 2: Convert to fraction form
    111.21/166.67 = 53.39/x
  3. Step 3: Cross multiply
    111.21x = 166.67 × 53.39
  4. Step 4: Simplify right side
    111.21x = 8,898.51
  5. Step 5: Solve for x
    x = 8,898.51/111.21
  6. Step 6: Final answer
    x = 80.02

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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.