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Finding the Fourth Proportional to 121.89, 181.31 and 110.35

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Solution

The fourth proportional to 121.89, 181.31 and 110.35 is: 164.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.89 : 181.31 = 110.35 : x
  2. Step 2: Convert to fraction form
    121.89/181.31 = 110.35/x
  3. Step 3: Cross multiply
    121.89x = 181.31 × 110.35
  4. Step 4: Simplify right side
    121.89x = 20,007.56
  5. Step 5: Solve for x
    x = 20,007.56/121.89
  6. Step 6: Final answer
    x = 164.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.