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Finding the Fourth Proportional to 287.90, 396.97 and 217.02

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Solution

The fourth proportional to 287.90, 396.97 and 217.02 is: 299.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.90 : 396.97 = 217.02 : x
  2. Step 2: Convert to fraction form
    287.90/396.97 = 217.02/x
  3. Step 3: Cross multiply
    287.90x = 396.97 × 217.02
  4. Step 4: Simplify right side
    287.90x = 86,150.43
  5. Step 5: Solve for x
    x = 86,150.43/287.90
  6. Step 6: Final answer
    x = 299.24

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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.