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Finding the Fourth Proportional to 427.95, 641.79 and 254.70

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Solution

The fourth proportional to 427.95, 641.79 and 254.70 is: 381.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.95 : 641.79 = 254.70 : x
  2. Step 2: Convert to fraction form
    427.95/641.79 = 254.70/x
  3. Step 3: Cross multiply
    427.95x = 641.79 × 254.70
  4. Step 4: Simplify right side
    427.95x = 163,463.91
  5. Step 5: Solve for x
    x = 163,463.91/427.95
  6. Step 6: Final answer
    x = 381.97

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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.