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Finding the Fourth Proportional to 255.30, 353.85 and 231

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Solution

The fourth proportional to 255.30, 353.85 and 231 is: 320.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.30 : 353.85 = 231 : x
  2. Step 2: Convert to fraction form
    255.30/353.85 = 231/x
  3. Step 3: Cross multiply
    255.30x = 353.85 × 231
  4. Step 4: Simplify right side
    255.30x = 81,739.35
  5. Step 5: Solve for x
    x = 81,739.35/255.30
  6. Step 6: Final answer
    x = 320.17

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.