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Finding the Fourth Proportional to 121.25, 166.86 and 117.29

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Solution

The fourth proportional to 121.25, 166.86 and 117.29 is: 161.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.25 : 166.86 = 117.29 : x
  2. Step 2: Convert to fraction form
    121.25/166.86 = 117.29/x
  3. Step 3: Cross multiply
    121.25x = 166.86 × 117.29
  4. Step 4: Simplify right side
    121.25x = 19,571.01
  5. Step 5: Solve for x
    x = 19,571.01/121.25
  6. Step 6: Final answer
    x = 161.41

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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.