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Finding the Fourth Proportional to 121.07, 166.97 and 100.31

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Solution

The fourth proportional to 121.07, 166.97 and 100.31 is: 138.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.07 : 166.97 = 100.31 : x
  2. Step 2: Convert to fraction form
    121.07/166.97 = 100.31/x
  3. Step 3: Cross multiply
    121.07x = 166.97 × 100.31
  4. Step 4: Simplify right side
    121.07x = 16,748.18
  5. Step 5: Solve for x
    x = 16,748.18/121.07
  6. Step 6: Final answer
    x = 138.33

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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.