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Finding the Fourth Proportional to 243.33, 335.80 and 138.43

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Solution

The fourth proportional to 243.33, 335.80 and 138.43 is: 191.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.33 : 335.80 = 138.43 : x
  2. Step 2: Convert to fraction form
    243.33/335.80 = 138.43/x
  3. Step 3: Cross multiply
    243.33x = 335.80 × 138.43
  4. Step 4: Simplify right side
    243.33x = 46,483.12
  5. Step 5: Solve for x
    x = 46,483.12/243.33
  6. Step 6: Final answer
    x = 191.03

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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.