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Finding the Fourth Proportional to 111.28, 165.93 and 103.18

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Solution

The fourth proportional to 111.28, 165.93 and 103.18 is: 153.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.28 : 165.93 = 103.18 : x
  2. Step 2: Convert to fraction form
    111.28/165.93 = 103.18/x
  3. Step 3: Cross multiply
    111.28x = 165.93 × 103.18
  4. Step 4: Simplify right side
    111.28x = 17,120.66
  5. Step 5: Solve for x
    x = 17,120.66/111.28
  6. Step 6: Final answer
    x = 153.85

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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.