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Finding the Fourth Proportional to 392.31, 541.17 and 287.64

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Solution

The fourth proportional to 392.31, 541.17 and 287.64 is: 396.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.31 : 541.17 = 287.64 : x
  2. Step 2: Convert to fraction form
    392.31/541.17 = 287.64/x
  3. Step 3: Cross multiply
    392.31x = 541.17 × 287.64
  4. Step 4: Simplify right side
    392.31x = 155,662.14
  5. Step 5: Solve for x
    x = 155,662.14/392.31
  6. Step 6: Final answer
    x = 396.78

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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.