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Finding the Fourth Proportional to 286.39, 394.01 and 220.78

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Solution

The fourth proportional to 286.39, 394.01 and 220.78 is: 303.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.39 : 394.01 = 220.78 : x
  2. Step 2: Convert to fraction form
    286.39/394.01 = 220.78/x
  3. Step 3: Cross multiply
    286.39x = 394.01 × 220.78
  4. Step 4: Simplify right side
    286.39x = 86,987.56
  5. Step 5: Solve for x
    x = 86,987.56/286.39
  6. Step 6: Final answer
    x = 303.74

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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.