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Finding the Fourth Proportional to 111.06, 166.43 and 80.63

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Solution

The fourth proportional to 111.06, 166.43 and 80.63 is: 120.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.06 : 166.43 = 80.63 : x
  2. Step 2: Convert to fraction form
    111.06/166.43 = 80.63/x
  3. Step 3: Cross multiply
    111.06x = 166.43 × 80.63
  4. Step 4: Simplify right side
    111.06x = 13,418.02
  5. Step 5: Solve for x
    x = 13,418.02/111.06
  6. Step 6: Final answer
    x = 120.82

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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.