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Finding the Fourth Proportional to 111.29, 153.44 and 91.55

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Solution

The fourth proportional to 111.29, 153.44 and 91.55 is: 126.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.29 : 153.44 = 91.55 : x
  2. Step 2: Convert to fraction form
    111.29/153.44 = 91.55/x
  3. Step 3: Cross multiply
    111.29x = 153.44 × 91.55
  4. Step 4: Simplify right side
    111.29x = 14,046.21
  5. Step 5: Solve for x
    x = 14,046.21/111.29
  6. Step 6: Final answer
    x = 126.22

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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.