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Finding the Fourth Proportional to 216.56, 324.92 and 139.67

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Solution

The fourth proportional to 216.56, 324.92 and 139.67 is: 209.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.56 : 324.92 = 139.67 : x
  2. Step 2: Convert to fraction form
    216.56/324.92 = 139.67/x
  3. Step 3: Cross multiply
    216.56x = 324.92 × 139.67
  4. Step 4: Simplify right side
    216.56x = 45,379.25
  5. Step 5: Solve for x
    x = 45,379.25/216.56
  6. Step 6: Final answer
    x = 209.55

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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.