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Finding the Fourth Proportional to 404.80, 556.88 and 395.55

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Solution

The fourth proportional to 404.80, 556.88 and 395.55 is: 544.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.80 : 556.88 = 395.55 : x
  2. Step 2: Convert to fraction form
    404.80/556.88 = 395.55/x
  3. Step 3: Cross multiply
    404.80x = 556.88 × 395.55
  4. Step 4: Simplify right side
    404.80x = 220,271.91
  5. Step 5: Solve for x
    x = 220,271.91/404.80
  6. Step 6: Final answer
    x = 544.15

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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.