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Finding the Fourth Proportional to 216.20, 324.36 and 86.26

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Solution

The fourth proportional to 216.20, 324.36 and 86.26 is: 129.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.20 : 324.36 = 86.26 : x
  2. Step 2: Convert to fraction form
    216.20/324.36 = 86.26/x
  3. Step 3: Cross multiply
    216.20x = 324.36 × 86.26
  4. Step 4: Simplify right side
    216.20x = 27,977.67
  5. Step 5: Solve for x
    x = 27,977.67/216.20
  6. Step 6: Final answer
    x = 129.41

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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.