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Finding the Fourth Proportional to 231.50, 318.13 and 220.79

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Solution

The fourth proportional to 231.50, 318.13 and 220.79 is: 303.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.50 : 318.13 = 220.79 : x
  2. Step 2: Convert to fraction form
    231.50/318.13 = 220.79/x
  3. Step 3: Cross multiply
    231.50x = 318.13 × 220.79
  4. Step 4: Simplify right side
    231.50x = 70,241.41
  5. Step 5: Solve for x
    x = 70,241.41/231.50
  6. Step 6: Final answer
    x = 303.42

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.