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Finding the Fourth Proportional to 255.74, 352.92 and 139.31

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Solution

The fourth proportional to 255.74, 352.92 and 139.31 is: 192.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.74 : 352.92 = 139.31 : x
  2. Step 2: Convert to fraction form
    255.74/352.92 = 139.31/x
  3. Step 3: Cross multiply
    255.74x = 352.92 × 139.31
  4. Step 4: Simplify right side
    255.74x = 49,163.87
  5. Step 5: Solve for x
    x = 49,163.87/255.74
  6. Step 6: Final answer
    x = 192.24

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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.