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Finding the Fourth Proportional to 111.12, 165.49 and 109.43

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Solution

The fourth proportional to 111.12, 165.49 and 109.43 is: 162.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.12 : 165.49 = 109.43 : x
  2. Step 2: Convert to fraction form
    111.12/165.49 = 109.43/x
  3. Step 3: Cross multiply
    111.12x = 165.49 × 109.43
  4. Step 4: Simplify right side
    111.12x = 18,109.40
  5. Step 5: Solve for x
    x = 18,109.40/111.12
  6. Step 6: Final answer
    x = 162.98

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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.