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Finding the Fourth Proportional to 403.22, 556.48 and 255.80

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Solution

The fourth proportional to 403.22, 556.48 and 255.80 is: 353.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.22 : 556.48 = 255.80 : x
  2. Step 2: Convert to fraction form
    403.22/556.48 = 255.80/x
  3. Step 3: Cross multiply
    403.22x = 556.48 × 255.80
  4. Step 4: Simplify right side
    403.22x = 142,347.58
  5. Step 5: Solve for x
    x = 142,347.58/403.22
  6. Step 6: Final answer
    x = 353.03

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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.