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Finding the Fourth Proportional to 255.75, 352.94 and 139.31

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Solution

The fourth proportional to 255.75, 352.94 and 139.31 is: 192.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.75 : 352.94 = 139.31 : x
  2. Step 2: Convert to fraction form
    255.75/352.94 = 139.31/x
  3. Step 3: Cross multiply
    255.75x = 352.94 × 139.31
  4. Step 4: Simplify right side
    255.75x = 49,168.26
  5. Step 5: Solve for x
    x = 49,168.26/255.75
  6. Step 6: Final answer
    x = 192.25

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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.