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Finding the Fourth Proportional to 255.81, 353.02 and 139.37

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Solution

The fourth proportional to 255.81, 353.02 and 139.37 is: 192.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.81 : 353.02 = 139.37 : x
  2. Step 2: Convert to fraction form
    255.81/353.02 = 139.37/x
  3. Step 3: Cross multiply
    255.81x = 353.02 × 139.37
  4. Step 4: Simplify right side
    255.81x = 49,198.82
  5. Step 5: Solve for x
    x = 49,198.82/255.81
  6. Step 6: Final answer
    x = 192.33

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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.