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Finding the Fourth Proportional to 417.53, 576.39 and 287.21

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Solution

The fourth proportional to 417.53, 576.39 and 287.21 is: 396.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.53 : 576.39 = 287.21 : x
  2. Step 2: Convert to fraction form
    417.53/576.39 = 287.21/x
  3. Step 3: Cross multiply
    417.53x = 576.39 × 287.21
  4. Step 4: Simplify right side
    417.53x = 165,544.97
  5. Step 5: Solve for x
    x = 165,544.97/417.53
  6. Step 6: Final answer
    x = 396.49

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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.