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Finding the Fourth Proportional to 121.28, 167.32 and 102.83

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Solution

The fourth proportional to 121.28, 167.32 and 102.83 is: 141.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.28 : 167.32 = 102.83 : x
  2. Step 2: Convert to fraction form
    121.28/167.32 = 102.83/x
  3. Step 3: Cross multiply
    121.28x = 167.32 × 102.83
  4. Step 4: Simplify right side
    121.28x = 17,204.42
  5. Step 5: Solve for x
    x = 17,204.42/121.28
  6. Step 6: Final answer
    x = 141.86

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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.