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Finding the Fourth Proportional to 243.28, 335.72 and 138.39

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Solution

The fourth proportional to 243.28, 335.72 and 138.39 is: 190.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.28 : 335.72 = 138.39 : x
  2. Step 2: Convert to fraction form
    243.28/335.72 = 138.39/x
  3. Step 3: Cross multiply
    243.28x = 335.72 × 138.39
  4. Step 4: Simplify right side
    243.28x = 46,457.92
  5. Step 5: Solve for x
    x = 46,457.92/243.28
  6. Step 6: Final answer
    x = 190.97

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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.