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Finding the Fourth Proportional to 217, 299.48 and 139.44

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Solution

The fourth proportional to 217, 299.48 and 139.44 is: 192.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    217 : 299.48 = 139.44 : x
  2. Step 2: Convert to fraction form
    217/299.48 = 139.44/x
  3. Step 3: Cross multiply
    217x = 299.48 × 139.44
  4. Step 4: Simplify right side
    217x = 41,759.49
  5. Step 5: Solve for x
    x = 41,759.49/217
  6. Step 6: Final answer
    x = 192.44

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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.