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Finding the Fourth Proportional to 243.44, 335.90 and 138.48

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Solution

The fourth proportional to 243.44, 335.90 and 138.48 is: 191.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.44 : 335.90 = 138.48 : x
  2. Step 2: Convert to fraction form
    243.44/335.90 = 138.48/x
  3. Step 3: Cross multiply
    243.44x = 335.90 × 138.48
  4. Step 4: Simplify right side
    243.44x = 46,514.74
  5. Step 5: Solve for x
    x = 46,514.74/243.44
  6. Step 6: Final answer
    x = 191.08

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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.