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Finding the Fourth Proportional to 286.74, 394.88 and 212.63

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Solution

The fourth proportional to 286.74, 394.88 and 212.63 is: 292.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.74 : 394.88 = 212.63 : x
  2. Step 2: Convert to fraction form
    286.74/394.88 = 212.63/x
  3. Step 3: Cross multiply
    286.74x = 394.88 × 212.63
  4. Step 4: Simplify right side
    286.74x = 83,960.30
  5. Step 5: Solve for x
    x = 83,960.30/286.74
  6. Step 6: Final answer
    x = 292.81

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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.