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Finding the Fourth Proportional to 121.31, 167.14 and 79.79

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Solution

The fourth proportional to 121.31, 167.14 and 79.79 is: 109.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.31 : 167.14 = 79.79 : x
  2. Step 2: Convert to fraction form
    121.31/167.14 = 79.79/x
  3. Step 3: Cross multiply
    121.31x = 167.14 × 79.79
  4. Step 4: Simplify right side
    121.31x = 13,335.28
  5. Step 5: Solve for x
    x = 13,335.28/121.31
  6. Step 6: Final answer
    x = 109.93

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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.