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Finding the Fourth Proportional to 255.72, 352.89 and 139.29

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Solution

The fourth proportional to 255.72, 352.89 and 139.29 is: 192.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.72 : 352.89 = 139.29 : x
  2. Step 2: Convert to fraction form
    255.72/352.89 = 139.29/x
  3. Step 3: Cross multiply
    255.72x = 352.89 × 139.29
  4. Step 4: Simplify right side
    255.72x = 49,152.28
  5. Step 5: Solve for x
    x = 49,152.28/255.72
  6. Step 6: Final answer
    x = 192.21

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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.