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Finding the Fourth Proportional to 428.74, 641.19 and 254.92

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Solution

The fourth proportional to 428.74, 641.19 and 254.92 is: 381.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.74 : 641.19 = 254.92 : x
  2. Step 2: Convert to fraction form
    428.74/641.19 = 254.92/x
  3. Step 3: Cross multiply
    428.74x = 641.19 × 254.92
  4. Step 4: Simplify right side
    428.74x = 163,452.15
  5. Step 5: Solve for x
    x = 163,452.15/428.74
  6. Step 6: Final answer
    x = 381.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.