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Finding the Fourth Proportional to 121.40, 183.41 and 120.32

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Solution

The fourth proportional to 121.40, 183.41 and 120.32 is: 181.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.40 : 183.41 = 120.32 : x
  2. Step 2: Convert to fraction form
    121.40/183.41 = 120.32/x
  3. Step 3: Cross multiply
    121.40x = 183.41 × 120.32
  4. Step 4: Simplify right side
    121.40x = 22,066.97
  5. Step 5: Solve for x
    x = 22,066.97/121.40
  6. Step 6: Final answer
    x = 181.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.