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Finding the Fourth Proportional to 403.41, 556.51 and 255.81

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Solution

The fourth proportional to 403.41, 556.51 and 255.81 is: 352.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.41 : 556.51 = 255.81 : x
  2. Step 2: Convert to fraction form
    403.41/556.51 = 255.81/x
  3. Step 3: Cross multiply
    403.41x = 556.51 × 255.81
  4. Step 4: Simplify right side
    403.41x = 142,362.27
  5. Step 5: Solve for x
    x = 142,362.27/403.41
  6. Step 6: Final answer
    x = 352.89

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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.