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Finding the Fourth Proportional to 394.92, 541.36 and 387.93

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Solution

The fourth proportional to 394.92, 541.36 and 387.93 is: 531.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.92 : 541.36 = 387.93 : x
  2. Step 2: Convert to fraction form
    394.92/541.36 = 387.93/x
  3. Step 3: Cross multiply
    394.92x = 541.36 × 387.93
  4. Step 4: Simplify right side
    394.92x = 210,012.30
  5. Step 5: Solve for x
    x = 210,012.30/394.92
  6. Step 6: Final answer
    x = 531.78

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.