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Finding the Fourth Proportional to 243.26, 335.73 and 139.78

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Solution

The fourth proportional to 243.26, 335.73 and 139.78 is: 192.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.26 : 335.73 = 139.78 : x
  2. Step 2: Convert to fraction form
    243.26/335.73 = 139.78/x
  3. Step 3: Cross multiply
    243.26x = 335.73 × 139.78
  4. Step 4: Simplify right side
    243.26x = 46,928.34
  5. Step 5: Solve for x
    x = 46,928.34/243.26
  6. Step 6: Final answer
    x = 192.91

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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.