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Finding the Fourth Proportional to 255.56, 352.67 and 139.12

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Solution

The fourth proportional to 255.56, 352.67 and 139.12 is: 191.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.56 : 352.67 = 139.12 : x
  2. Step 2: Convert to fraction form
    255.56/352.67 = 139.12/x
  3. Step 3: Cross multiply
    255.56x = 352.67 × 139.12
  4. Step 4: Simplify right side
    255.56x = 49,062.66
  5. Step 5: Solve for x
    x = 49,062.66/255.56
  6. Step 6: Final answer
    x = 191.98

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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.