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Finding the Fourth Proportional to 121.69, 167.43 and 105.29

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Solution

The fourth proportional to 121.69, 167.43 and 105.29 is: 144.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.69 : 167.43 = 105.29 : x
  2. Step 2: Convert to fraction form
    121.69/167.43 = 105.29/x
  3. Step 3: Cross multiply
    121.69x = 167.43 × 105.29
  4. Step 4: Simplify right side
    121.69x = 17,628.70
  5. Step 5: Solve for x
    x = 17,628.70/121.69
  6. Step 6: Final answer
    x = 144.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.