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Finding the Fourth Proportional to 300.12, 414.21 and 217.20

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Solution

The fourth proportional to 300.12, 414.21 and 217.20 is: 299.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.12 : 414.21 = 217.20 : x
  2. Step 2: Convert to fraction form
    300.12/414.21 = 217.20/x
  3. Step 3: Cross multiply
    300.12x = 414.21 × 217.20
  4. Step 4: Simplify right side
    300.12x = 89,966.45
  5. Step 5: Solve for x
    x = 89,966.45/300.12
  6. Step 6: Final answer
    x = 299.77

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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.