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Finding the Fourth Proportional to 393.92, 543.42 and 261.17

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Solution

The fourth proportional to 393.92, 543.42 and 261.17 is: 360.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.92 : 543.42 = 261.17 : x
  2. Step 2: Convert to fraction form
    393.92/543.42 = 261.17/x
  3. Step 3: Cross multiply
    393.92x = 543.42 × 261.17
  4. Step 4: Simplify right side
    393.92x = 141,922.28
  5. Step 5: Solve for x
    x = 141,922.28/393.92
  6. Step 6: Final answer
    x = 360.29

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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.