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Finding the Fourth Proportional to 216.27, 324.45 and 86.31

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Solution

The fourth proportional to 216.27, 324.45 and 86.31 is: 129.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.27 : 324.45 = 86.31 : x
  2. Step 2: Convert to fraction form
    216.27/324.45 = 86.31/x
  3. Step 3: Cross multiply
    216.27x = 324.45 × 86.31
  4. Step 4: Simplify right side
    216.27x = 28,003.28
  5. Step 5: Solve for x
    x = 28,003.28/216.27
  6. Step 6: Final answer
    x = 129.48

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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.