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Finding the Fourth Proportional to 287.28, 396.54 and 217.35

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Solution

The fourth proportional to 287.28, 396.54 and 217.35 is: 300.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.28 : 396.54 = 217.35 : x
  2. Step 2: Convert to fraction form
    287.28/396.54 = 217.35/x
  3. Step 3: Cross multiply
    287.28x = 396.54 × 217.35
  4. Step 4: Simplify right side
    287.28x = 86,187.97
  5. Step 5: Solve for x
    x = 86,187.97/287.28
  6. Step 6: Final answer
    x = 300.01

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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.