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Finding the Fourth Proportional to 243.79, 336.42 and 138.85

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Solution

The fourth proportional to 243.79, 336.42 and 138.85 is: 191.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.79 : 336.42 = 138.85 : x
  2. Step 2: Convert to fraction form
    243.79/336.42 = 138.85/x
  3. Step 3: Cross multiply
    243.79x = 336.42 × 138.85
  4. Step 4: Simplify right side
    243.79x = 46,711.08
  5. Step 5: Solve for x
    x = 46,711.08/243.79
  6. Step 6: Final answer
    x = 191.61

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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.