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Finding the Fourth Proportional to 216.22, 324.40 and 79.31

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Solution

The fourth proportional to 216.22, 324.40 and 79.31 is: 118.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.22 : 324.40 = 79.31 : x
  2. Step 2: Convert to fraction form
    216.22/324.40 = 79.31/x
  3. Step 3: Cross multiply
    216.22x = 324.40 × 79.31
  4. Step 4: Simplify right side
    216.22x = 25,728.16
  5. Step 5: Solve for x
    x = 25,728.16/216.22
  6. Step 6: Final answer
    x = 118.99

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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.