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Finding the Fourth Proportional to 255.09, 382.26 and 139.56

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Solution

The fourth proportional to 255.09, 382.26 and 139.56 is: 209.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.09 : 382.26 = 139.56 : x
  2. Step 2: Convert to fraction form
    255.09/382.26 = 139.56/x
  3. Step 3: Cross multiply
    255.09x = 382.26 × 139.56
  4. Step 4: Simplify right side
    255.09x = 53,348.21
  5. Step 5: Solve for x
    x = 53,348.21/255.09
  6. Step 6: Final answer
    x = 209.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.