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Finding the Fourth Proportional to 121.70, 167.68 and 88.90

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Solution

The fourth proportional to 121.70, 167.68 and 88.90 is: 122.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.70 : 167.68 = 88.90 : x
  2. Step 2: Convert to fraction form
    121.70/167.68 = 88.90/x
  3. Step 3: Cross multiply
    121.70x = 167.68 × 88.90
  4. Step 4: Simplify right side
    121.70x = 14,906.75
  5. Step 5: Solve for x
    x = 14,906.75/121.70
  6. Step 6: Final answer
    x = 122.49

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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.