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Finding the Fourth Proportional to 255.65, 352.80 and 139.21

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Solution

The fourth proportional to 255.65, 352.80 and 139.21 is: 192.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.65 : 352.80 = 139.21 : x
  2. Step 2: Convert to fraction form
    255.65/352.80 = 139.21/x
  3. Step 3: Cross multiply
    255.65x = 352.80 × 139.21
  4. Step 4: Simplify right side
    255.65x = 49,112.59
  5. Step 5: Solve for x
    x = 49,112.59/255.65
  6. Step 6: Final answer
    x = 192.11

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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.