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Finding the Fourth Proportional to 300.79, 414.72 and 213.31

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Solution

The fourth proportional to 300.79, 414.72 and 213.31 is: 294.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.79 : 414.72 = 213.31 : x
  2. Step 2: Convert to fraction form
    300.79/414.72 = 213.31/x
  3. Step 3: Cross multiply
    300.79x = 414.72 × 213.31
  4. Step 4: Simplify right side
    300.79x = 88,463.92
  5. Step 5: Solve for x
    x = 88,463.92/300.79
  6. Step 6: Final answer
    x = 294.11

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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.