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Finding the Fourth Proportional to 318.25, 439.20 and 231.07

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Solution

The fourth proportional to 318.25, 439.20 and 231.07 is: 318.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.25 : 439.20 = 231.07 : x
  2. Step 2: Convert to fraction form
    318.25/439.20 = 231.07/x
  3. Step 3: Cross multiply
    318.25x = 439.20 × 231.07
  4. Step 4: Simplify right side
    318.25x = 101,485.94
  5. Step 5: Solve for x
    x = 101,485.94/318.25
  6. Step 6: Final answer
    x = 318.89

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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.