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Finding the Fourth Proportional to 403.19, 555.94 and 255.59

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Solution

The fourth proportional to 403.19, 555.94 and 255.59 is: 352.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.19 : 555.94 = 255.59 : x
  2. Step 2: Convert to fraction form
    403.19/555.94 = 255.59/x
  3. Step 3: Cross multiply
    403.19x = 555.94 × 255.59
  4. Step 4: Simplify right side
    403.19x = 142,092.70
  5. Step 5: Solve for x
    x = 142,092.70/403.19
  6. Step 6: Final answer
    x = 352.42

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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.