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Finding the Fourth Proportional to 287.94, 396.42 and 256.28

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Solution

The fourth proportional to 287.94, 396.42 and 256.28 is: 352.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.94 : 396.42 = 256.28 : x
  2. Step 2: Convert to fraction form
    287.94/396.42 = 256.28/x
  3. Step 3: Cross multiply
    287.94x = 396.42 × 256.28
  4. Step 4: Simplify right side
    287.94x = 101,594.52
  5. Step 5: Solve for x
    x = 101,594.52/287.94
  6. Step 6: Final answer
    x = 352.83

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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.