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Finding the Fourth Proportional to 121.63, 181.70 and 109.43

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Solution

The fourth proportional to 121.63, 181.70 and 109.43 is: 163.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.63 : 181.70 = 109.43 : x
  2. Step 2: Convert to fraction form
    121.63/181.70 = 109.43/x
  3. Step 3: Cross multiply
    121.63x = 181.70 × 109.43
  4. Step 4: Simplify right side
    121.63x = 19,882.62
  5. Step 5: Solve for x
    x = 19,882.62/121.63
  6. Step 6: Final answer
    x = 163.46

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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.