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Finding the Fourth Proportional to 217.22, 299.87 and 139.64

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Solution

The fourth proportional to 217.22, 299.87 and 139.64 is: 192.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.22 : 299.87 = 139.64 : x
  2. Step 2: Convert to fraction form
    217.22/299.87 = 139.64/x
  3. Step 3: Cross multiply
    217.22x = 299.87 × 139.64
  4. Step 4: Simplify right side
    217.22x = 41,871.65
  5. Step 5: Solve for x
    x = 41,871.65/217.22
  6. Step 6: Final answer
    x = 192.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.