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Finding the Fourth Proportional to 158.44, 218.85 and 121.79

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Solution

The fourth proportional to 158.44, 218.85 and 121.79 is: 168.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.44 : 218.85 = 121.79 : x
  2. Step 2: Convert to fraction form
    158.44/218.85 = 121.79/x
  3. Step 3: Cross multiply
    158.44x = 218.85 × 121.79
  4. Step 4: Simplify right side
    158.44x = 26,653.29
  5. Step 5: Solve for x
    x = 26,653.29/158.44
  6. Step 6: Final answer
    x = 168.22

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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.