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Finding the Fourth Proportional to 255.70, 352.87 and 139.27

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Solution

The fourth proportional to 255.70, 352.87 and 139.27 is: 192.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.70 : 352.87 = 139.27 : x
  2. Step 2: Convert to fraction form
    255.70/352.87 = 139.27/x
  3. Step 3: Cross multiply
    255.70x = 352.87 × 139.27
  4. Step 4: Simplify right side
    255.70x = 49,142.84
  5. Step 5: Solve for x
    x = 49,142.84/255.70
  6. Step 6: Final answer
    x = 192.19

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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.