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Finding the Fourth Proportional to 121.25, 167.27 and 79.82

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Solution

The fourth proportional to 121.25, 167.27 and 79.82 is: 110.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.25 : 167.27 = 79.82 : x
  2. Step 2: Convert to fraction form
    121.25/167.27 = 79.82/x
  3. Step 3: Cross multiply
    121.25x = 167.27 × 79.82
  4. Step 4: Simplify right side
    121.25x = 13,352.11
  5. Step 5: Solve for x
    x = 13,352.11/121.25
  6. Step 6: Final answer
    x = 110.13

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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.