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Finding the Fourth Proportional to 231.66, 347.22 and 218.16

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Solution

The fourth proportional to 231.66, 347.22 and 218.16 is: 326.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.66 : 347.22 = 218.16 : x
  2. Step 2: Convert to fraction form
    231.66/347.22 = 218.16/x
  3. Step 3: Cross multiply
    231.66x = 347.22 × 218.16
  4. Step 4: Simplify right side
    231.66x = 75,749.52
  5. Step 5: Solve for x
    x = 75,749.52/231.66
  6. Step 6: Final answer
    x = 326.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.