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Finding the Fourth Proportional to 394.15, 543.89 and 236.79

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Solution

The fourth proportional to 394.15, 543.89 and 236.79 is: 326.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.15 : 543.89 = 236.79 : x
  2. Step 2: Convert to fraction form
    394.15/543.89 = 236.79/x
  3. Step 3: Cross multiply
    394.15x = 543.89 × 236.79
  4. Step 4: Simplify right side
    394.15x = 128,785.34
  5. Step 5: Solve for x
    x = 128,785.34/394.15
  6. Step 6: Final answer
    x = 326.74

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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.