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Finding the Fourth Proportional to 403.11, 555.80 and 255.69

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Solution

The fourth proportional to 403.11, 555.80 and 255.69 is: 352.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.11 : 555.80 = 255.69 : x
  2. Step 2: Convert to fraction form
    403.11/555.80 = 255.69/x
  3. Step 3: Cross multiply
    403.11x = 555.80 × 255.69
  4. Step 4: Simplify right side
    403.11x = 142,111.22
  5. Step 5: Solve for x
    x = 142,111.22/403.11
  6. Step 6: Final answer
    x = 352.54

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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.