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Finding the Fourth Proportional to 404.85, 554.97 and 399.39

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Solution

The fourth proportional to 404.85, 554.97 and 399.39 is: 547.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.85 : 554.97 = 399.39 : x
  2. Step 2: Convert to fraction form
    404.85/554.97 = 399.39/x
  3. Step 3: Cross multiply
    404.85x = 554.97 × 399.39
  4. Step 4: Simplify right side
    404.85x = 221,649.47
  5. Step 5: Solve for x
    x = 221,649.47/404.85
  6. Step 6: Final answer
    x = 547.49

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.