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Finding the Fourth Proportional to 111.26, 166.62 and 76.98

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Solution

The fourth proportional to 111.26, 166.62 and 76.98 is: 115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.26 : 166.62 = 76.98 : x
  2. Step 2: Convert to fraction form
    111.26/166.62 = 76.98/x
  3. Step 3: Cross multiply
    111.26x = 166.62 × 76.98
  4. Step 4: Simplify right side
    111.26x = 12,826.41
  5. Step 5: Solve for x
    x = 12,826.41/111.26
  6. Step 6: Final answer
    x = 115.28

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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.