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Finding the Fourth Proportional to 255.73, 352.90 and 139.29

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Solution

The fourth proportional to 255.73, 352.90 and 139.29 is: 192.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.73 : 352.90 = 139.29 : x
  2. Step 2: Convert to fraction form
    255.73/352.90 = 139.29/x
  3. Step 3: Cross multiply
    255.73x = 352.90 × 139.29
  4. Step 4: Simplify right side
    255.73x = 49,155.44
  5. Step 5: Solve for x
    x = 49,155.44/255.73
  6. Step 6: Final answer
    x = 192.22

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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.