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Finding the Fourth Proportional to 394.11, 543.95 and 261.35

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Solution

The fourth proportional to 394.11, 543.95 and 261.35 is: 360.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.11 : 543.95 = 261.35 : x
  2. Step 2: Convert to fraction form
    394.11/543.95 = 261.35/x
  3. Step 3: Cross multiply
    394.11x = 543.95 × 261.35
  4. Step 4: Simplify right side
    394.11x = 142,161.86
  5. Step 5: Solve for x
    x = 142,161.86/394.11
  6. Step 6: Final answer
    x = 360.72

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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.