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Finding the Fourth Proportional to 404.40, 556.80 and 355.44

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Solution

The fourth proportional to 404.40, 556.80 and 355.44 is: 489.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.40 : 556.80 = 355.44 : x
  2. Step 2: Convert to fraction form
    404.40/556.80 = 355.44/x
  3. Step 3: Cross multiply
    404.40x = 556.80 × 355.44
  4. Step 4: Simplify right side
    404.40x = 197,908.99
  5. Step 5: Solve for x
    x = 197,908.99/404.40
  6. Step 6: Final answer
    x = 489.39

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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.