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Finding the Fourth Proportional to 287.62, 396.88 and 163.28

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Solution

The fourth proportional to 287.62, 396.88 and 163.28 is: 225.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.62 : 396.88 = 163.28 : x
  2. Step 2: Convert to fraction form
    287.62/396.88 = 163.28/x
  3. Step 3: Cross multiply
    287.62x = 396.88 × 163.28
  4. Step 4: Simplify right side
    287.62x = 64,802.57
  5. Step 5: Solve for x
    x = 64,802.57/287.62
  6. Step 6: Final answer
    x = 225.31

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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.