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Finding the Fourth Proportional to 310.63, 428.88 and 255.55

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Solution

The fourth proportional to 310.63, 428.88 and 255.55 is: 352.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.63 : 428.88 = 255.55 : x
  2. Step 2: Convert to fraction form
    310.63/428.88 = 255.55/x
  3. Step 3: Cross multiply
    310.63x = 428.88 × 255.55
  4. Step 4: Simplify right side
    310.63x = 109,600.28
  5. Step 5: Solve for x
    x = 109,600.28/310.63
  6. Step 6: Final answer
    x = 352.83

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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.