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Finding the Fourth Proportional to 286.23, 394.20 and 285.42

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Solution

The fourth proportional to 286.23, 394.20 and 285.42 is: 393.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.23 : 394.20 = 285.42 : x
  2. Step 2: Convert to fraction form
    286.23/394.20 = 285.42/x
  3. Step 3: Cross multiply
    286.23x = 394.20 × 285.42
  4. Step 4: Simplify right side
    286.23x = 112,512.56
  5. Step 5: Solve for x
    x = 112,512.56/286.23
  6. Step 6: Final answer
    x = 393.08

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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.