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Finding the Fourth Proportional to 111.55, 166.52 and 103.84

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Solution

The fourth proportional to 111.55, 166.52 and 103.84 is: 155.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.55 : 166.52 = 103.84 : x
  2. Step 2: Convert to fraction form
    111.55/166.52 = 103.84/x
  3. Step 3: Cross multiply
    111.55x = 166.52 × 103.84
  4. Step 4: Simplify right side
    111.55x = 17,291.44
  5. Step 5: Solve for x
    x = 17,291.44/111.55
  6. Step 6: Final answer
    x = 155.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.