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Finding the Fourth Proportional to 411.20, 568.04 and 287.20

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Solution

The fourth proportional to 411.20, 568.04 and 287.20 is: 396.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.20 : 568.04 = 287.20 : x
  2. Step 2: Convert to fraction form
    411.20/568.04 = 287.20/x
  3. Step 3: Cross multiply
    411.20x = 568.04 × 287.20
  4. Step 4: Simplify right side
    411.20x = 163,141.09
  5. Step 5: Solve for x
    x = 163,141.09/411.20
  6. Step 6: Final answer
    x = 396.74

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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.