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Finding the Fourth Proportional to 121.68, 183.51 and 105.75

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Solution

The fourth proportional to 121.68, 183.51 and 105.75 is: 159.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.68 : 183.51 = 105.75 : x
  2. Step 2: Convert to fraction form
    121.68/183.51 = 105.75/x
  3. Step 3: Cross multiply
    121.68x = 183.51 × 105.75
  4. Step 4: Simplify right side
    121.68x = 19,406.18
  5. Step 5: Solve for x
    x = 19,406.18/121.68
  6. Step 6: Final answer
    x = 159.49

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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.