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Finding the Fourth Proportional to 255.61, 352.74 and 139.17

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Solution

The fourth proportional to 255.61, 352.74 and 139.17 is: 192.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.61 : 352.74 = 139.17 : x
  2. Step 2: Convert to fraction form
    255.61/352.74 = 139.17/x
  3. Step 3: Cross multiply
    255.61x = 352.74 × 139.17
  4. Step 4: Simplify right side
    255.61x = 49,092.15
  5. Step 5: Solve for x
    x = 49,092.15/255.61
  6. Step 6: Final answer
    x = 192.06

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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.