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Finding the Fourth Proportional to 111.80, 153.96 and 92.21

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Solution

The fourth proportional to 111.80, 153.96 and 92.21 is: 126.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.80 : 153.96 = 92.21 : x
  2. Step 2: Convert to fraction form
    111.80/153.96 = 92.21/x
  3. Step 3: Cross multiply
    111.80x = 153.96 × 92.21
  4. Step 4: Simplify right side
    111.80x = 14,195.88
  5. Step 5: Solve for x
    x = 14,195.88/111.80
  6. Step 6: Final answer
    x = 126.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.