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Finding the Fourth Proportional to 121.78, 167.69 and 104.16

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Solution

The fourth proportional to 121.78, 167.69 and 104.16 is: 143.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.78 : 167.69 = 104.16 : x
  2. Step 2: Convert to fraction form
    121.78/167.69 = 104.16/x
  3. Step 3: Cross multiply
    121.78x = 167.69 × 104.16
  4. Step 4: Simplify right side
    121.78x = 17,466.07
  5. Step 5: Solve for x
    x = 17,466.07/121.78
  6. Step 6: Final answer
    x = 143.43

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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.