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Finding the Fourth Proportional to 331.20, 456.89 and 231.57

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Solution

The fourth proportional to 331.20, 456.89 and 231.57 is: 319.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.20 : 456.89 = 231.57 : x
  2. Step 2: Convert to fraction form
    331.20/456.89 = 231.57/x
  3. Step 3: Cross multiply
    331.20x = 456.89 × 231.57
  4. Step 4: Simplify right side
    331.20x = 105,800.86
  5. Step 5: Solve for x
    x = 105,800.86/331.20
  6. Step 6: Final answer
    x = 319.45

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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.