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Finding the Fourth Proportional to 243.38, 335.87 and 139.88

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Solution

The fourth proportional to 243.38, 335.87 and 139.88 is: 193.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.38 : 335.87 = 139.88 : x
  2. Step 2: Convert to fraction form
    243.38/335.87 = 139.88/x
  3. Step 3: Cross multiply
    243.38x = 335.87 × 139.88
  4. Step 4: Simplify right side
    243.38x = 46,979.12
  5. Step 5: Solve for x
    x = 46,979.12/243.38
  6. Step 6: Final answer
    x = 193.03

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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.