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Finding the Fourth Proportional to 428.78, 591.72 and 254.24

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Solution

The fourth proportional to 428.78, 591.72 and 254.24 is: 350.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.78 : 591.72 = 254.24 : x
  2. Step 2: Convert to fraction form
    428.78/591.72 = 254.24/x
  3. Step 3: Cross multiply
    428.78x = 591.72 × 254.24
  4. Step 4: Simplify right side
    428.78x = 150,438.89
  5. Step 5: Solve for x
    x = 150,438.89/428.78
  6. Step 6: Final answer
    x = 350.85

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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.