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Finding the Fourth Proportional to 217.28, 299.50 and 139.52

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Solution

The fourth proportional to 217.28, 299.50 and 139.52 is: 192.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.28 : 299.50 = 139.52 : x
  2. Step 2: Convert to fraction form
    217.28/299.50 = 139.52/x
  3. Step 3: Cross multiply
    217.28x = 299.50 × 139.52
  4. Step 4: Simplify right side
    217.28x = 41,786.24
  5. Step 5: Solve for x
    x = 41,786.24/217.28
  6. Step 6: Final answer
    x = 192.32

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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.