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Finding the Fourth Proportional to 216.16, 324.36 and 139.30

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Solution

The fourth proportional to 216.16, 324.36 and 139.30 is: 209.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.16 : 324.36 = 139.30 : x
  2. Step 2: Convert to fraction form
    216.16/324.36 = 139.30/x
  3. Step 3: Cross multiply
    216.16x = 324.36 × 139.30
  4. Step 4: Simplify right side
    216.16x = 45,183.35
  5. Step 5: Solve for x
    x = 45,183.35/216.16
  6. Step 6: Final answer
    x = 209.03

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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.