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Finding the Fourth Proportional to 121.34, 167.47 and 68.90

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Solution

The fourth proportional to 121.34, 167.47 and 68.90 is: 95.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.34 : 167.47 = 68.90 : x
  2. Step 2: Convert to fraction form
    121.34/167.47 = 68.90/x
  3. Step 3: Cross multiply
    121.34x = 167.47 × 68.90
  4. Step 4: Simplify right side
    121.34x = 11,538.68
  5. Step 5: Solve for x
    x = 11,538.68/121.34
  6. Step 6: Final answer
    x = 95.09

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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.