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Finding the Fourth Proportional to 111.90, 167.49 and 79.38

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Solution

The fourth proportional to 111.90, 167.49 and 79.38 is: 118.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.90 : 167.49 = 79.38 : x
  2. Step 2: Convert to fraction form
    111.90/167.49 = 79.38/x
  3. Step 3: Cross multiply
    111.90x = 167.49 × 79.38
  4. Step 4: Simplify right side
    111.90x = 13,295.36
  5. Step 5: Solve for x
    x = 13,295.36/111.90
  6. Step 6: Final answer
    x = 118.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.