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Finding the Fourth Proportional to 121.05, 166.87 and 104.38

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Solution

The fourth proportional to 121.05, 166.87 and 104.38 is: 143.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.05 : 166.87 = 104.38 : x
  2. Step 2: Convert to fraction form
    121.05/166.87 = 104.38/x
  3. Step 3: Cross multiply
    121.05x = 166.87 × 104.38
  4. Step 4: Simplify right side
    121.05x = 17,417.60
  5. Step 5: Solve for x
    x = 17,417.60/121.05
  6. Step 6: Final answer
    x = 143.89

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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.