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Finding the Fourth Proportional to 243.25, 335.66 and 138.33

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Solution

The fourth proportional to 243.25, 335.66 and 138.33 is: 190.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.25 : 335.66 = 138.33 : x
  2. Step 2: Convert to fraction form
    243.25/335.66 = 138.33/x
  3. Step 3: Cross multiply
    243.25x = 335.66 × 138.33
  4. Step 4: Simplify right side
    243.25x = 46,430.93
  5. Step 5: Solve for x
    x = 46,430.93/243.25
  6. Step 6: Final answer
    x = 190.88

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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.