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Finding the Fourth Proportional to 428.64, 591.92 and 281.44

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Solution

The fourth proportional to 428.64, 591.92 and 281.44 is: 388.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.64 : 591.92 = 281.44 : x
  2. Step 2: Convert to fraction form
    428.64/591.92 = 281.44/x
  3. Step 3: Cross multiply
    428.64x = 591.92 × 281.44
  4. Step 4: Simplify right side
    428.64x = 166,589.96
  5. Step 5: Solve for x
    x = 166,589.96/428.64
  6. Step 6: Final answer
    x = 388.65

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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.