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Finding the Fourth Proportional to 394.07, 543.90 and 261.29

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Solution

The fourth proportional to 394.07, 543.90 and 261.29 is: 360.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.07 : 543.90 = 261.29 : x
  2. Step 2: Convert to fraction form
    394.07/543.90 = 261.29/x
  3. Step 3: Cross multiply
    394.07x = 543.90 × 261.29
  4. Step 4: Simplify right side
    394.07x = 142,112.91
  5. Step 5: Solve for x
    x = 142,112.91/394.07
  6. Step 6: Final answer
    x = 360.63

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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.