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Finding the Fourth Proportional to 111.13, 166.57 and 53.31

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Solution

The fourth proportional to 111.13, 166.57 and 53.31 is: 79.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.13 : 166.57 = 53.31 : x
  2. Step 2: Convert to fraction form
    111.13/166.57 = 53.31/x
  3. Step 3: Cross multiply
    111.13x = 166.57 × 53.31
  4. Step 4: Simplify right side
    111.13x = 8,879.85
  5. Step 5: Solve for x
    x = 8,879.85/111.13
  6. Step 6: Final answer
    x = 79.91

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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.