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Finding the Fourth Proportional to 331.12, 456.94 and 206.80

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Solution

The fourth proportional to 331.12, 456.94 and 206.80 is: 285.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.12 : 456.94 = 206.80 : x
  2. Step 2: Convert to fraction form
    331.12/456.94 = 206.80/x
  3. Step 3: Cross multiply
    331.12x = 456.94 × 206.80
  4. Step 4: Simplify right side
    331.12x = 94,495.19
  5. Step 5: Solve for x
    x = 94,495.19/331.12
  6. Step 6: Final answer
    x = 285.38

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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.