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Finding the Fourth Proportional to 121.32, 167.45 and 92.16

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Solution

The fourth proportional to 121.32, 167.45 and 92.16 is: 127.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.32 : 167.45 = 92.16 : x
  2. Step 2: Convert to fraction form
    121.32/167.45 = 92.16/x
  3. Step 3: Cross multiply
    121.32x = 167.45 × 92.16
  4. Step 4: Simplify right side
    121.32x = 15,431.73
  5. Step 5: Solve for x
    x = 15,431.73/121.32
  6. Step 6: Final answer
    x = 127.20

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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.