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Finding the Fourth Proportional to 402.80, 556.04 and 255.64

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Solution

The fourth proportional to 402.80, 556.04 and 255.64 is: 352.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.80 : 556.04 = 255.64 : x
  2. Step 2: Convert to fraction form
    402.80/556.04 = 255.64/x
  3. Step 3: Cross multiply
    402.80x = 556.04 × 255.64
  4. Step 4: Simplify right side
    402.80x = 142,146.07
  5. Step 5: Solve for x
    x = 142,146.07/402.80
  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.