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Finding the Fourth Proportional to 243.37, 335.85 and 138.46

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Solution

The fourth proportional to 243.37, 335.85 and 138.46 is: 191.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.37 : 335.85 = 138.46 : x
  2. Step 2: Convert to fraction form
    243.37/335.85 = 138.46/x
  3. Step 3: Cross multiply
    243.37x = 335.85 × 138.46
  4. Step 4: Simplify right side
    243.37x = 46,501.79
  5. Step 5: Solve for x
    x = 46,501.79/243.37
  6. Step 6: Final answer
    x = 191.07

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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.