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Finding the Fourth Proportional to 330.21, 455.79 and 205.98

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Solution

The fourth proportional to 330.21, 455.79 and 205.98 is: 284.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.21 : 455.79 = 205.98 : x
  2. Step 2: Convert to fraction form
    330.21/455.79 = 205.98/x
  3. Step 3: Cross multiply
    330.21x = 455.79 × 205.98
  4. Step 4: Simplify right side
    330.21x = 93,882.69
  5. Step 5: Solve for x
    x = 93,882.69/330.21
  6. Step 6: Final answer
    x = 284.31

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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.