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Finding the Fourth Proportional to 329.85, 455.31 and 231.66

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Solution

The fourth proportional to 329.85, 455.31 and 231.66 is: 319.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.85 : 455.31 = 231.66 : x
  2. Step 2: Convert to fraction form
    329.85/455.31 = 231.66/x
  3. Step 3: Cross multiply
    329.85x = 455.31 × 231.66
  4. Step 4: Simplify right side
    329.85x = 105,477.11
  5. Step 5: Solve for x
    x = 105,477.11/329.85
  6. Step 6: Final answer
    x = 319.77

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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.