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Finding the Fourth Proportional to 417.75, 576.56 and 399.29

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Solution

The fourth proportional to 417.75, 576.56 and 399.29 is: 551.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.75 : 576.56 = 399.29 : x
  2. Step 2: Convert to fraction form
    417.75/576.56 = 399.29/x
  3. Step 3: Cross multiply
    417.75x = 576.56 × 399.29
  4. Step 4: Simplify right side
    417.75x = 230,217.08
  5. Step 5: Solve for x
    x = 230,217.08/417.75
  6. Step 6: Final answer
    x = 551.09

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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.