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Finding the Fourth Proportional to 216.10, 324.18 and 79.18

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Solution

The fourth proportional to 216.10, 324.18 and 79.18 is: 118.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.10 : 324.18 = 79.18 : x
  2. Step 2: Convert to fraction form
    216.10/324.18 = 79.18/x
  3. Step 3: Cross multiply
    216.10x = 324.18 × 79.18
  4. Step 4: Simplify right side
    216.10x = 25,668.57
  5. Step 5: Solve for x
    x = 25,668.57/216.10
  6. Step 6: Final answer
    x = 118.78

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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.