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Finding the Fourth Proportional to 111.14, 165.91 and 103.13

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Solution

The fourth proportional to 111.14, 165.91 and 103.13 is: 153.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.14 : 165.91 = 103.13 : x
  2. Step 2: Convert to fraction form
    111.14/165.91 = 103.13/x
  3. Step 3: Cross multiply
    111.14x = 165.91 × 103.13
  4. Step 4: Simplify right side
    111.14x = 17,110.30
  5. Step 5: Solve for x
    x = 17,110.30/111.14
  6. Step 6: Final answer
    x = 153.95

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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.