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Finding the Fourth Proportional to 111.81, 155.27 and 110.90

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Solution

The fourth proportional to 111.81, 155.27 and 110.90 is: 153.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.81 : 155.27 = 110.90 : x
  2. Step 2: Convert to fraction form
    111.81/155.27 = 110.90/x
  3. Step 3: Cross multiply
    111.81x = 155.27 × 110.90
  4. Step 4: Simplify right side
    111.81x = 17,218.11
  5. Step 5: Solve for x
    x = 17,218.11/111.81
  6. Step 6: Final answer
    x = 153.99

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.