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Finding the Fourth Proportional to 220.36, 303.84 and 154.78

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Solution

The fourth proportional to 220.36, 303.84 and 154.78 is: 213.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.36 : 303.84 = 154.78 : x
  2. Step 2: Convert to fraction form
    220.36/303.84 = 154.78/x
  3. Step 3: Cross multiply
    220.36x = 303.84 × 154.78
  4. Step 4: Simplify right side
    220.36x = 47,028.36
  5. Step 5: Solve for x
    x = 47,028.36/220.36
  6. Step 6: Final answer
    x = 213.42

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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.