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Finding the Fourth Proportional to 392.64, 541.35 and 287.88

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Solution

The fourth proportional to 392.64, 541.35 and 287.88 is: 396.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.64 : 541.35 = 287.88 : x
  2. Step 2: Convert to fraction form
    392.64/541.35 = 287.88/x
  3. Step 3: Cross multiply
    392.64x = 541.35 × 287.88
  4. Step 4: Simplify right side
    392.64x = 155,843.84
  5. Step 5: Solve for x
    x = 155,843.84/392.64
  6. Step 6: Final answer
    x = 396.91

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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.