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Finding the Fourth Proportional to 393.43, 543.11 and 275.43

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Solution

The fourth proportional to 393.43, 543.11 and 275.43 is: 380.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.43 : 543.11 = 275.43 : x
  2. Step 2: Convert to fraction form
    393.43/543.11 = 275.43/x
  3. Step 3: Cross multiply
    393.43x = 543.11 × 275.43
  4. Step 4: Simplify right side
    393.43x = 149,584.86
  5. Step 5: Solve for x
    x = 149,584.86/393.43
  6. Step 6: Final answer
    x = 380.20

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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.